 Potential Brake Failure?, Loss of brake pedal position |
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| rbzymek |
 Jul 23 2026, 02:14 PM
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#1
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Member  Group: Members Posts: 203 Joined: 5-April 19 From: Northville, MI Member No.: 23,013 Region Association: Upper MidWest 
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I was hoping for some direction to correct a brake issue. While driving last week my right foot was resting on the brake pedal and then it started moving down! The brakes still worked but the pedal was way lower than design position. I pulled over immediately and had the car towed home. I installed a new master cylinder 7 years ago (about 13,000 miles) from 914Rubber (not uro). All four corners were rebuilt by PMB. New flex hoses and pads were also installed. Brakes have been working fine prior to this hiccup. Fluid resevior was full and no leaks detected.
So I suspect the M/C but are there any other possibilities? Thanks in advance! |
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| emerygt350 |
Jul 23 2026, 08:06 PM
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Advanced Member Group: Members Posts: 3,676 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
The only other thing would be a sudden change in the rear brake adjusters which seems impossible.... What happens when you pull the parking brake? Does the pedal travel decrease?
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| rbzymek |
Jul 24 2026, 09:24 AM
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#3
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Member Group: Members Posts: 203 Joined: 5-April 19 From: Northville, MI Member No.: 23,013 Region Association: Upper MidWest
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QUOTE(emerygt350 @ Jul 23 2026, 10:06 PM)  The only other thing would be a sudden change in the rear brake adjusters which seems impossible.... What happens when you pull the parking brake? Does the pedal travel decrease? The hand brake has no affect. It behaves normally as far as pedal travel. I plan to bleed the system and watch it closely. |
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Posts in this topic
rbzymek Potential Brake Failure? Jul 23 2026, 02:14 PM
bkrantz If truly no leaks and no fluid loss it might likel... Jul 23 2026, 07:48 PM
flipb The MC mounts to relatively thin metal that is kno... Jul 24 2026, 09:41 AM Ninja Any aftermarket master cylinder is suspect...
914... Jul 24 2026, 10:29 AM brant Did you pull the pedal board and then pull the rub... Jul 24 2026, 10:44 AM 914Sixer Sent PM Jul 24 2026, 01:59 PM
fiacra Sounds like an MC internal seal failure. If you p... Jul 24 2026, 02:39 PM |
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