72 Booster

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72Hardtop
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Location: Seattle, WA./HB. Ca./Shizuoka, Japan
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72 Booster

Post by 72Hardtop » Sat Nov 10, 2018 4:59 am

Can't recall if the booster can be removed without removal of the MC? Would like to avoid the need to bleed the fill/system.

I've checked all the lines from the booster back to the engine and they all check out fine (no leaks). Left work the other day and quickly realized diminished brake power and lean condition on my LM-2 when applying the brakes. Not fun having to stand on the brake pedal with no headroom :shaking: Was about to get onto freeway...could have been worse...much worse.

The booster installed is the original ATE booster. I ordered another http://www2.cip1.com/ProductDetails.asp ... 11-612-103

It's an ATE German
1972 Westy tintop
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's

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tristessa
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Location: Uwish Uknew, Oregon
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Re: 72 Booster

Post by tristessa » Sat Nov 10, 2018 1:59 pm

I've done it without removing the MC, but I really wouldn't dick around doing it that way again. More work, more hassle, and often the MC fails in a way that leaks fluid into the booster, so you're replacing the MC anyway. Get the knockoff Mightyvac from Harbor Freight -- better than the real one IMHO because it's all metal -- take the opportunity to flush the fluid and put in all new stuff.

My $0.02
Remember, only YOU can prevent narcissism!

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Amskeptic
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Re: 72 Booster

Post by Amskeptic » Mon Nov 12, 2018 7:38 am

72Hardtop wrote:
Sat Nov 10, 2018 4:59 am
A) Left work the other day and quickly realized diminished brake power and lean condition on my LM-2 when applying the brakes.

B) Not fun having to stand on the brake pedal with no headroom :shaking: Was about to get onto freeway...could have been worse...much worse.

a) This may or may not be the booster. All a/f meters would catch a booster's request for vacuum and release of that vacuum to atmosphere. It is a potential indication of a problem IF the lean condition remains as you hold the pedal down. Normally, it is a transitory gulp. Diminished boost without indication of a vacuum leak CAN come from the other side of the booster equation; the atmosphere side. When the brake is applied, it is not just the engine sucking at the diaphragm, it is the atmosphere being allowed to push the other side of the diaphragm (in a VW bus the *front* chamber of the booster. This atmosphere path comes from the driver's side B pillar, through a hose to the pushrod plastic housing, and through a green foam filter that, when it clogs up, kills about half of your boost.

b) Eat yer Wheaties. One in twenty of my peeps is driving around with the booster disconnected for some reason or another. It merely reminds you of 1969 all over again! Step on it, man.
Colin
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles

72Hardtop
Old School!
Location: Seattle, WA./HB. Ca./Shizuoka, Japan
Status: Offline

Re: 72 Booster

Post by 72Hardtop » Sat Nov 17, 2018 9:42 am

Amskeptic wrote:
Mon Nov 12, 2018 7:38 am
72Hardtop wrote:
Sat Nov 10, 2018 4:59 am
A) Left work the other day and quickly realized diminished brake power and lean condition on my LM-2 when applying the brakes.

B) Not fun having to stand on the brake pedal with no headroom :shaking: Was about to get onto freeway...could have been worse...much worse.

a) This may or may not be the booster. All a/f meters would catch a booster's request for vacuum and release of that vacuum to atmosphere. It is a potential indication of a problem IF the lean condition remains as you hold the pedal down. Normally, it is a transitory gulp. Diminished boost without indication of a vacuum leak CAN come from the other side of the booster equation; the atmosphere side. When the brake is applied, it is not just the engine sucking at the diaphragm, it is the atmosphere being allowed to push the other side of the diaphragm (in a VW bus the *front* chamber of the booster. This atmosphere path comes from the driver's side B pillar, through a hose to the pushrod plastic housing, and through a green foam filter that, when it clogs up, kills about half of your boost.

b) Eat yer Wheaties. One in twenty of my peeps is driving around with the booster disconnected for some reason or another. It merely reminds you of 1969 all over again! Step on it, man.
Colin
Already confirmed it's not the atmosphere side of the boost. Clear. If holding the brake down the LM-2 reading will shoot up and hover 30:0-40:0 AFR if held. Let go and it returns to ~13.5 or so LBI. Checked all the lines from boost to engine and they are fine. Even pulled the balance tube and checked it (Passenger side is plugged) Hooked to #3 port on intake manifold (hose is good).

On the flip side I did get my German ATE booster.
Attachments
20181113_092003[1].jpg
1972 Westy tintop
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's

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Amskeptic
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Re: 72 Booster

Post by Amskeptic » Sat Nov 17, 2018 9:53 am

72Hardtop wrote:
Sat Nov 17, 2018 9:42 am
A) If holding the brake down the LM-2 reading will shoot up and hover 30:0-40:0 AFR. Let go and it returns to ~13.5 or so LBI.

B) On the flip side I did get my German ATE booster.

a) Well that thar is a bad booster den.

b) And that thar is a fine piece of equipment.
Colin
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles

72Hardtop
Old School!
Location: Seattle, WA./HB. Ca./Shizuoka, Japan
Status: Offline

Re: 72 Booster

Post by 72Hardtop » Sat Nov 17, 2018 10:06 am

More pics of booster....
Attachments
20181117_085713[1].jpg
20181117_085535[1].jpg
1972 Westy tintop
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's

72Hardtop
Old School!
Location: Seattle, WA./HB. Ca./Shizuoka, Japan
Status: Offline

Re: 72 Booster

Post by 72Hardtop » Sat Nov 17, 2018 10:08 am

More pics....
Attachments
20181117_085757[1].jpg
20181117_085743[1].jpg
1972 Westy tintop
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's

72Hardtop
Old School!
Location: Seattle, WA./HB. Ca./Shizuoka, Japan
Status: Offline

Re: 72 Booster

Post by 72Hardtop » Sat Nov 17, 2018 10:20 am

And more....
Attachments
20181117_085830[1].jpg
20181117_085816[1].jpg
1972 Westy tintop
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's

72Hardtop
Old School!
Location: Seattle, WA./HB. Ca./Shizuoka, Japan
Status: Offline

Re: 72 Booster

Post by 72Hardtop » Sat Nov 17, 2018 10:22 am

And more....1st pic is looking into where the atmosphere hose attaches on booster.
Attachments
20181117_090025[1].jpg
20181117_085907[1].jpg
1972 Westy tintop
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's

72Hardtop
Old School!
Location: Seattle, WA./HB. Ca./Shizuoka, Japan
Status: Offline

Re: 72 Booster

Post by 72Hardtop » Sat Nov 17, 2018 10:25 am

Old booster shots....
Attachments
20181108_232730[1].jpg
20181108_232510[1].jpg
1972 Westy tintop
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's

72Hardtop
Old School!
Location: Seattle, WA./HB. Ca./Shizuoka, Japan
Status: Offline

Re: 72 Booster

Post by 72Hardtop » Sat Nov 17, 2018 10:28 am

Amskeptic wrote:
Sat Nov 17, 2018 9:53 am
72Hardtop wrote:
Sat Nov 17, 2018 9:42 am
A) If holding the brake down the LM-2 reading will shoot up and hover 30:0-40:0 AFR. Let go and it returns to ~13.5 or so LBI.

B) On the flip side I did get my German ATE booster.

a) Well that thar is a bad booster den.

b) And that thar is a fine piece of equipment.
Colin

It was the last one they had. Score... :cheers:

And for $30.00 off. Final $269.00
1972 Westy tintop
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's

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asiab3
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Location: San Diego, CA
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Re: 72 Booster

Post by asiab3 » Sat Nov 17, 2018 2:06 pm

Amskeptic wrote:
Mon Nov 12, 2018 7:38 am
One in twenty of my peeps is driving around with the booster disconnected for some reason or another. It merely reminds you of 1969 all over again! Step on it, man.

Wimps.

Image
1969 bus, "Buddy."
145k miles with me.
322k miles on Earth.

72Hardtop
Old School!
Location: Seattle, WA./HB. Ca./Shizuoka, Japan
Status: Offline

Re: 72 Booster

Post by 72Hardtop » Sat Nov 17, 2018 6:17 pm

Got it all apart.

Have not had to add fluid to the reservoir bottle inside (full) but once the booster was off and tipped brake fluid come a rolling out. Damn...WTH...

Oh well back on line for another MC (ATE). Also picked up a MC reservoir bottle for 72 and some grommets. Can't remember the last time I put fluid in the interior bottle quite some time ago. Perhaps the fluid was from the last MC swap ~15 years or so ago.
1972 Westy tintop
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's

User avatar
Amskeptic
IAC "Help Desk"
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Re: 72 Booster

Post by Amskeptic » Sat Nov 17, 2018 9:11 pm

72Hardtop wrote:
Sat Nov 17, 2018 10:28 am
It was the last one they had. Score... :cheers:
And for $30.00 off. Final $269.00

Man, I was locked and loaded and ready to pull the trigger . . .
Colin
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles

72Hardtop
Old School!
Location: Seattle, WA./HB. Ca./Shizuoka, Japan
Status: Offline

Re: 72 Booster

Post by 72Hardtop » Sun Nov 18, 2018 11:58 am

Amskeptic wrote:
Sat Nov 17, 2018 9:11 pm
72Hardtop wrote:
Sat Nov 17, 2018 10:28 am
It was the last one they had. Score... :cheers:
And for $30.00 off. Final $269.00

Man, I was locked and loaded and ready to pull the trigger . . .
Colin
That was off the cip1.com site. BusDepot carries ATE German one. Buy while you still can...
1972 Westy tintop
2056cc T-4 - 7.8:1 CR
Weber 40mm Duals - 47.5idles, 125mains, F11 tubes, 190 Air corr., 28mm Vents
96mm AA Biral P/C's w/Hastings rings
42x36mm Heads (AMC- Headflow Masters) w/Porsche swivel adjusters
71mm Stroke
Web Cam 73 w/matched Web lifters
S&S 4-1 exhaust w/Walker 17862 quiet-pack
Pertronix SVDA w/Pertronix module & Flamethrower 40K coil (7* initial 28* total @3200+)
NGK BP6ET plugs
002 3 rib trans
Hankook 185R14's

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