1st pump = manual brakes, 2nd pump = power brakes
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- IAC Addict!
- Location: Metro Detroit
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1st pump = manual brakes, 2nd pump = power brakes
Have a 77 westy, and as the subject line reads: 1st pump feels like manual brakes, 2nd pump feels like power brakes. Brake pedal doesn't feel soft ... don't think it's a master cylinder issue; feels more like the power assist isn't asisting.
What are likely causes, where should I start the diagnosis?
What are likely causes, where should I start the diagnosis?
1976 VW Bus aka tripod
FI ...not leaky, and not so noisy...and she runs awesome!
FI ...not leaky, and not so noisy...and she runs awesome!
hambone wrote: There are those out there with no other aim but to bunch panties. It's like arguing with a pretzel.
- Amskeptic
- IAC "Help Desk"
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Re: 1st pump = manual brakes, 2nd pump = power brakes
How did it develop? Slowly or all of a sudden? Did you recently install a check valve backwards?TrollFromDownBelow wrote:Have a 77 westy, and as the subject line reads: 1st pump feels like manual brakes, 2nd pump feels like power brakes. Brake pedal doesn't feel soft ... don't think it's a master cylinder issue; feels more like the power assist isn't asisting.
What are likely causes, where should I start the diagnosis?
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
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
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- IAC Addict!
- Location: Metro Detroit
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oops ... I have a 76 ... not a 77 :). Haven't installed any check valves. not sure if it is all of a sudden, or think it's simply that I just noticed it.
1976 VW Bus aka tripod
FI ...not leaky, and not so noisy...and she runs awesome!
FI ...not leaky, and not so noisy...and she runs awesome!
hambone wrote: There are those out there with no other aim but to bunch panties. It's like arguing with a pretzel.
- Amskeptic
- IAC "Help Desk"
- Status: Offline
It is a weird symptom. Check check valve. And we need to develop our forum skill set to include booster rebuilding.TrollFromDownBelow wrote:oops ... I have a 76 ... not a 77 :). Haven't installed any check valves. not sure if it is all of a sudden, or think it's simply that I just noticed it.
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
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
- karl
- Getting Hooked!
- Location: Coos Bay, Oregon
- Status: Offline
I am not sure the general public can buy the internal parts. Hard to beat the price when H & R in Texas rebuilds them for around $85 for one day service.Amskeptic wrote: And we need to develop our forum skill set to include booster rebuilding.
Colin
H & R Automotive Parts
10328 Oakwood Dr
Dallas, TX 75217
972-286-5516
- hambone
- Post-Industrial Non-Secular Mennonite
- Location: Portland, Ore.
- Status: Offline
Karl you are a wealth of incredible information! Thank you even tho I don't need a booster. (kind of like those old VW ads with all the parts you don't need laid out, radiator driveshaft etc. Ironic eh?)
http://greencascadia.blogspot.com
http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
- Amskeptic
- IAC "Help Desk"
- Status: Offline
karl wrote:I am not sure the general public can buy the internal parts. Hard to beat the price when H & R in Texas rebuilds them for around $85 for one day service.Amskeptic wrote: And we need to develop our forum skill set to include booster rebuilding.
Colin
H & R Automotive Parts
10328 Oakwood Dr
Dallas, TX 75217
972-286-5516
They are a good source, but for those of us who are deeply appreciative of the engineering of fine parts such as our boosters, it sure would be nice to knock out our own rebuilds. I have done one, I was marvelling at how simple yet precise these things are. I love the control valves, they are art.
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
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
-
- IAC Addict!
- Location: Metro Detroit
- Status: Offline
FWIW - I done figgered it out. Had some leaky rear wheel cylinders. Replaced those, had the drums turned (they were scored pretty bad) put some new shoes on her - and viola! No more double pumping. She always stopped well, no she stops even gooder Parking brake now only comes out about an inch or so ... like it should.
Gotta admit, these are the easiest drum brakes I've ever done ... just assemble everything first, and then plop the whole assembly in. Very elegant in it simplicity. Only thing I'm not fond of is having two adjusters per side.
Gotta admit, these are the easiest drum brakes I've ever done ... just assemble everything first, and then plop the whole assembly in. Very elegant in it simplicity. Only thing I'm not fond of is having two adjusters per side.
1976 VW Bus aka tripod
FI ...not leaky, and not so noisy...and she runs awesome!
FI ...not leaky, and not so noisy...and she runs awesome!
hambone wrote: There are those out there with no other aim but to bunch panties. It's like arguing with a pretzel.
- Amskeptic
- IAC "Help Desk"
- Status: Offline
Oh stop it. You LIKE having something to do while you nap under the bus.TrollFromDownBelow wrote:Only thing I'm not fond of is having two adjusters per side.
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
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
- dhoch14
- Old School!
- Location: Granada, ES
- Status: Offline
It's now $150...at least when I called last month. Still worth it though!karl wrote:I am not sure the general public can buy the internal parts. Hard to beat the price when H & R in Texas rebuilds them for around $85 for one day service.Amskeptic wrote: And we need to develop our forum skill set to include booster rebuilding.
Colin
H & R Automotive Parts
10328 Oakwood Dr
Dallas, TX 75217
972-286-5516
93 VW T4 2.4D Cali
- JereandJess
- Getting Hooked!
- Location: Ashburnham, MA
- Status: Offline
- Amskeptic
- IAC "Help Desk"
- Status: Offline
$100.00 is the official quote.JereandJess wrote:Ours is on it's way back to us, hopefully here tomorrow!
Charged $100 plus $14 for UPS shipping.
Better than BusDepot's rebuilt for $189 and certainly better than new!
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
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