Later classic brake master failure.

 Created by: CooperTune
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 Posted: Jul 11, 2019 04:17AM
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I have opened several of this type master and not felt like I could kit them due to rust pits after honing with a proper hone. I did make a fixture and a long bar and rebuilt the booster. Twisting them back together is a trip.

CTR-ALEX, has provided daily transportation for the last 176,000 miles. First gear synchro is poor second not far behind. As soon as the Dodge pickup, AC system, suspension and brakes are done the mini will get a long over due rest. Steve (CTR)

 Posted: Jul 10, 2019 10:14AM
 Edited:  Jul 11, 2019 06:00AM
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I have seen the two seals leak under the plastic reservoir between the reservoir and the metal master cylinder itself.


If in doubt, flat out. Colin Mc Rae MBE 1968-2007.

Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.

 Posted: Jul 9, 2019 10:08AM
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GB

I rebuilt a Knightsbridge MC for a friend last year - no wet inside the servo but the fluid was all gone.

Seal kit and all was well, and it's not too bad a job.

 Posted: Jul 3, 2019 02:09PM
 Edited:  Jul 9, 2019 10:26AM
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Quote:
Originally Posted by CooperTune
My classic has taken to smoking a little on start up. It also seems to want to foul #1 plug. I was beginning to think I have a guide or ring issue. On the way to DMV to get tags for my new to me truck (not mini ) the brake pedal on my mini went way close to the floor. Being a friday and late at that I stopped and checked fluid level. All gone and checking at each wheel showed no leaks. This is a master/booster combo that mounts on the wrong side of the car and has a torque tube to cross over. I believe the seal for the rear brakes fails and the booster sucks all the fluid out of master and feeds it to the engine. Anyone ellse have this issue? Steve (CTR)

PS I still made the DMV needing the truck plates even more with mini repair to deal with.
Loosen up the master cylinder and feel inside the servo, the bellows usually have brake fluid in them.


If in doubt, flat out. Colin Mc Rae MBE 1968-2007.

Give a car more power and it goes faster on the straights,
make a car lighter and it's faster everywhere. Colin Chapman.

 Posted: Jul 3, 2019 09:00AM
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Quote:
Originally Posted by CooperTune
My classic has taken to smoking a little on start up. It also seems to want to foul #1 plug. I was beginning to think I have a guide or ring issue. On the way to DMV to get tags for my new to me truck (not mini ) the brake pedal on my mini went way close to the floor. Being a friday and late at that I stopped and checked fluid level. All gone and checking at each wheel showed no leaks. This is a master/booster combo that mounts on the wrong side of the car and has a torque tube to cross over. I believe the seal for the rear brakes fails and the booster sucks all the fluid out of master and feeds it to the engine. Anyone ellse have this issue? Steve (CTR)

PS I still made the DMV needing the truck plates even more with mini repair to deal with.
Just replaced my green tag for the same reason, they puke into the servo, ruin the servo and then requiring complete replacement.

 

 

 Posted: Jul 3, 2019 06:42AM
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Quote:
Originally Posted by CooperTune
My classic has taken to smoking a little on start up. It also seems to want to foul #1 plug. I was beginning to think I have a guide or ring issue. On the way to DMV to get tags for my new to me truck (not mini ) the brake pedal on my mini went way close to the floor. Being a friday and late at that I stopped and checked fluid level. All gone and checking at each wheel showed no leaks. This is a master/booster combo that mounts on the wrong side of the car and has a torque tube to cross over. I believe the seal for the rear brakes fails and the booster sucks all the fluid out of master and feeds it to the engine. Anyone ellse have this issue? Steve (CTR)

PS I still made the DMV needing the truck plates even more with mini repair to deal with.
Well Steve did you notice any white smoke coming out of the exhaust? When the servo fails on the Cooper 'S (remote servo not like you have) it can suck brake fluid into the engine.

 Posted: Jul 3, 2019 06:41AM
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cooper tune.. yea common problem for me..  is the master cly at GMC 163??  later bc

 Posted: Jul 3, 2019 06:29AM
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CA
Sounds like a typical classic Mini adventure to me.

.

"Hang on a minute lads....I've got a great idea."

 Posted: Jul 3, 2019 05:25AM
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My classic has taken to smoking a little on start up. It also seems to want to foul #1 plug. I was beginning to think I have a guide or ring issue. On the way to DMV to get tags for my new to me truck (not mini ) the brake pedal on my mini went way close to the floor. Being a friday and late at that I stopped and checked fluid level. All gone and checking at each wheel showed no leaks. This is a master/booster combo that mounts on the wrong side of the car and has a torque tube to cross over. I believe the seal for the rear brakes fails and the booster sucks all the fluid out of master and feeds it to the engine. Anyone ellse have this issue? Steve (CTR)

PS I still made the DMV needing the truck plates even more with mini repair to deal with.