Brake Fluid Flush GMT800

[WFO]

The brake pedal on my 03 goes down just a little bit more than normal. Brakes work fine though, and master cylinder is still full, with the original fluid in it. Has 72k miles on it.

I'm about to flush it the old fashioned way with a helper, and I was wondering if I need to do anything different due to the ABS?

 

[Edelbrock]

I would try this:

Have someone start the engine and stomp hard on the brakes repeatedly while you check each rubber brake hose for bulging and replace any that are. Should be 3 hoses to check. Then I would bleed the brakes starting with the shortest brake line and ending with the longest brake line - so probably LF RF LR RR. Once this is done, the brake peddle should be back to normal.

If there is a bulging hose, then replacing the fluid wont help anything.

If there is no air in the system, then replacing all of the fluid might introduce air, compounding the problem - making it harder to isolate.


Brake fluid wont compress, regardless of its age.

 

[fast 99]

If the excessive travel developed with a full master here are a few possibilities. Am sure there are others. Rear shoes out of adjustment if drum brakes, as suggested swelling brake hose, bad master, loose front wheel bearings causing pad retraction, tight wheel cylinder or caliper. I would do a complete inspection and if nothing found flush fluid being very careful not to run it out.

As an alternate get a turkey baster suck the fluid out of master and refill. Won't be as good as a flush but better than doing nothing.