Rear Brakes Locking Up

[bookit]

Let’s think simple for a minute check the “E” brake / parking brake to make sure they are fully releasing the lever should release nearly to the rear shoe it only takes a little bit of tension on that cable to make a rear wheel lock up also make sure the rear brake shoes are the correct size and installed correctly

 

[Knuck55]

Was not going to sift 8 pages but Make SURE the master cyl has been bench bled correctly. Seen that problem more than once. Sorry if this has been mentioned already.

 

[59840Surfer]

Never push a brake pedal to the floor.

If the master is contaminated - it can pack crap in the forward piston seal and ruin it.

Always assume the master is contaminated and put a 2x4 or 4x4 under the pedal to keep your "helper" from jamming it all the way down.

Good help is hard to find and bad help makes you buy a lot of extra parts.

In all my years as a Brake/Lamp/Smog Inspector for the state of California, I have never seen GM use cross-fed brakes; that is if one fails the other two will take up the load, diagonally.

Dual masters have always had a front-rear split in that once the proportioning valve shuttles to the leaking side, the brakes that are applied are the survivors ---> front or rear.

Yes --- there were systems that shut off any flow to the ruptured system (front or rear) because the reservoir only had a small dam to keep the front and rear fluid kinda-sortta-almost segregated.

Has anyone told the OP to physically inspect the rear brakes for 90wt or brake fluid contamination or reversed primary/secondary shoes?

Brakes that grab or chatter or make noise, do it for a simple reason --- stop looking for zebras when you hear hoofbeats. Dem's only horses!

 

[Ricko1966]

Never push a brake pedal to the floor.

If the master is contaminated - it can pack crap in the forward piston seal and ruin it.

Always assume the master is contaminated and put a 2x4 or 4x4 under the pedal to keep your "helper" from jamming it all the way down.

Good help is hard to find and bad help makes you buy a lot of extra parts.

In all my years as a Brake/Lamp/Smog Inspector for the state of California, I have never seen GM use cross-fed brakes; that is if one fails the other two will take up the load, diagonally.

Dual masters have always had a front-rear split in that once the proportioning valve shuttles to the leaking side, the brakes that are applied are the survivors ---> front or rear.

Yes --- there were systems that shut off any flow to the ruptured system (front or rear) because the reservoir only had a small dam to keep the front and rear fluid kinda-sortta-almost segregated.

Has anyone told the OP to physically inspect the rear brakes for 90wt or brake fluid contamination or reversed primary/secondary shoes?

Brakes that grab or chatter or make noise, do it for a simple reason --- stop looking for zebras when you hear hoofbeats. Dem's only horses!

O.P. had his brake lines reversed at the master. So bias was totally wrong.

 

[idahovette]

I thought some of the old Citations had the cross split systems