Bad servo?
Thread Starter
|
Tuned
Joined: Oct 2020
Posts: 260
Likes: 12
From: Lakeville, MN
Bad servo?
I just installed new brake lines, new combination valve, calipers, rotors, and rear brake shoes. I've bled the brakes, MC, and the combination valve-with that special tool. I have a very firm pedal w/o engine running. Rear brakes are adjusted so that the pads are lightly rubbing.
When the engine is running, the pedal goes the the floor. Vacuum leak? Bad servo? Super frustrated....
When the engine is running, the pedal goes the the floor. Vacuum leak? Bad servo? Super frustrated....
Logistics Pro
Joined: Jul 2005
Posts: 4,217
Likes: 154
I think that is going to be a bad power brake booster/servo.
Sometimes when that happens with the brakes applying themselves, the internally leaking vacuum in the booster can actually suck brake fluid through the master cylinder's rear seal, and into the engine - which then makes the engine run like crap.
Adam over at Rare Classic Cars & Automotive History on youtube had this problem on an early-or-mid '70s full size Mercury. I'm hoping he'll revisit that car when it's repaired, and confirm or rule out my diagnosis.
Sometimes when that happens with the brakes applying themselves, the internally leaking vacuum in the booster can actually suck brake fluid through the master cylinder's rear seal, and into the engine - which then makes the engine run like crap.
Adam over at Rare Classic Cars & Automotive History on youtube had this problem on an early-or-mid '70s full size Mercury. I'm hoping he'll revisit that car when it's repaired, and confirm or rule out my diagnosis.
Thread
Thread Starter
Forum
Replies
Last Post
Fords412
1968-Present E-Series Van/Cutaway/Chassis
16
Nov 17, 2016 02:31 PM
