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Master Cylinder - Weeping Front Seal
- Curt Schulze
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05 Mar 2023 13:36 #46904
by Curt Schulze
The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt
Replied by Curt Schulze on topic Master Cylinder - Weeping Front Seal
On an Auburn , the stop light switch is at the front, that is where I thought in tas leaking.
The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt
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- Terry Cockerell
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05 Mar 2023 01:49 #46902
by Terry Cockerell
T cockerell
Replied by Terry Cockerell on topic Master Cylinder - Weeping Front Seal
Curt the weep is at the front of the master cylinder. No leaks occurred when I pressure tested the master cylinder on the bench . The leak only showed up when fitted in the car.
The leak is at the secondary cup Item No 2 in the attached picture
The leak is at the secondary cup Item No 2 in the attached picture
T cockerell
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- Curt Schulze
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04 Mar 2023 23:12 #46900
by Curt Schulze
The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt
Replied by Curt Schulze on topic Master Cylinder - Weeping Front Seal
Well then, either the mating surfaces are not flush, the washer is bad or the threads are comprimised. I am unsure what kind of thread locker can be used in that situation.
The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt
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- Terry Cockerell
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04 Mar 2023 22:33 - 04 Mar 2023 22:36 #46898
by Terry Cockerell
T cockerell
Replied by Terry Cockerell on topic Master Cylinder - Weeping Front Seal
Thanks Gary and Curt, no I am not using silicone, I'm using DOT 4 brake fluid.
I tried silicone brake fluid and gave up on it. Everything was cleaned properly before using the DOT 4.
I tried silicone brake fluid and gave up on it. Everything was cleaned properly before using the DOT 4.
T cockerell
Last edit: 04 Mar 2023 22:36 by Terry Cockerell. Reason: Revising text
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- Curt Schulze
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04 Mar 2023 21:55 #46896
by Curt Schulze
The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt
Replied by Curt Schulze on topic Master Cylinder - Weeping Front Seal
Are you using silicone brake fluid ?
The bitterness of poor quality remains long after the sweetness of low price is forgotten.
Be of Good Cheer
Curt
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- 1748 S
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04 Mar 2023 15:42 #46895
by 1748 S
Replied by 1748 S on topic Master Cylinder - Weeping Front Seal
Terry what brake fluid are you using? Not sure what the standard master cylinder clearance is supposed to be. I realize the cup stays under a small amount of pressure at all times to help keep the cup open to the bore. Hopefully someone with more information will chime in. Car looks gorgeous.
Gary Parsons
Gary Parsons
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- Terry Cockerell
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04 Mar 2023 08:21 #46893
by Terry Cockerell
T cockerell
Master Cylinder - Weeping Front Seal was created by Terry Cockerell
After going through the complete braking system the front seal on the master cylinder is still weeping.
I had honed then polished the master cylinder and wheel cylinders, fitted new rubber seals as well as new pistons. I had made a new master cylinder piston with 0.003" clearance. The push rod had also been aligned. Pressure testing the master cylinder on the bench resulted in no leakage, so after fitting the master cylinder and pressure bleeding the system I am puzzled as to why the front seal is weeping.
Any comments would be appreciated, she is almost ready for the road.
I had honed then polished the master cylinder and wheel cylinders, fitted new rubber seals as well as new pistons. I had made a new master cylinder piston with 0.003" clearance. The push rod had also been aligned. Pressure testing the master cylinder on the bench resulted in no leakage, so after fitting the master cylinder and pressure bleeding the system I am puzzled as to why the front seal is weeping.
Any comments would be appreciated, she is almost ready for the road.
T cockerell
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