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Old 03-28-2015, 10:18 AM   #1
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Join Date: Jun 2014
Location: LB, Germany
Posts: 1,512
Sounds like a defect master brake cylinder.

Some ideas:

Break fluid level is OK and brake fluid is new and the complete system was ventilated lately?

Do you have a MT? Was the line to the clutch slave cylinder also ventilated? If not, this sometimes causes strange effects.

Was the system ventilated correctly? Longest brake line to shortest?

Did you use a pressure system to ventilate the brake system? If you use too much pressure this can harm the ABS system. Also you can damage the fluid reservoir container. I think 1 bar is enough for that system. Especially if the cars get older.

If you've done a brake fluid change lately, has the problem appeared after that? So maybe something went wrong.

If you did a complete and proper break fluid change and there is still a problem you should check the master and slave brake cylinder. If you have a MT with a clutch you should also check the slave cylinder on the clutch.

Regards Markus
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Old 04-07-2015, 09:24 PM   #2
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Join Date: Feb 2007
Location: Australia
Posts: 220
Fluid is fine & haven't changed for a while.

Drains were blocked but not a lot of water in the battery compartment & it has been raining pretty heavy here for a few days.

Might just change out the bosster & hope for the best.

Quote:
Originally Posted by Smallblock454 View Post
Sounds like a defect master brake cylinder.

Some ideas:

Break fluid level is OK and brake fluid is new and the complete system was ventilated lately?

Do you have a MT? Was the line to the clutch slave cylinder also ventilated? If not, this sometimes causes strange effects.

Was the system ventilated correctly? Longest brake line to shortest?

Did you use a pressure system to ventilate the brake system? If you use too much pressure this can harm the ABS system. Also you can damage the fluid reservoir container. I think 1 bar is enough for that system. Especially if the cars get older.

If you've done a brake fluid change lately, has the problem appeared after that? So maybe something went wrong.

If you did a complete and proper break fluid change and there is still a problem you should check the master and slave brake cylinder. If you have a MT with a clutch you should also check the slave cylinder on the clutch.

Regards Markus
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