Rear brakes lock up real easy

[BigRedWeather]

A couple years ago my rear brakes would lock before my front brakes would begin to grab. I adjusted the rear brakes carefully and replaced the e-brake cable and lubricated all the contact points in the rear brakes. No real change. Then I disconnected the connector that goes from the brake master cylinder and removed the spring from the RABS valve. No change. After running this way for a year or so my rear brakes still grab before the front ones grab. If I need to stop quickly I can press the pedal hard, the fronts to their job and one or both of the rears lock up.

A few questions:

-Has anyone seen a truck like mine improve its rear brake when the RABS valve was put back in service?
-Any suggestions on what is wrong with the brakes?


Thanks,


BigRedWeather

 

[Kevin 007]

Sorry, I don't know the solution but I can tell you that it is common. I bet I have driven half a dozen that do this.

 

[79jasper]

Ya know, just out of curiosity, have you ever replaced the front rubber lines?

Or the master cylinder?

 

[97psdcrew]

What you need to do is bleed the front brakes really well. What I beleive is happening is the front brakes aren't working properly and the rear are over working, hence they are locking up.
This has happened to me before, and after $600 dollars later wasted at the local repair shop, trying everything from booster to proportioning valve, to rear cyclinders, finaly bled the front caliper and everything worked great.

 

[BigRedWeather]

One mechanic said the first thing he does with my situation is to replace the front rubber lines. I did that, but to no avail.

Well, its nice to know that I don't own the only odd ball.

Obviously I have bled the front brakes, but I will try again to blead them really well.


I'll see what happens.

 

[BigRedWeather]

I overlooked the master cylinder part. I replaced that 3-4 years ago. Would consider replacing it again.