86 chevy G30 (6.2L): brake problems

[Mr. Bone]

The front brakes are locking up when the engine gets hot. Not when i'm driving at highway speeds . . .ONLY in the city or when i slow down. I know it has to do with heat from the engine not dissapating and heating up a valve or component. It is ONLY the front brakes. I changed the rubber portion of the line on the disc brakes and that did not do the trick. Please offer any thoughts or an isbn or reference to the helm manual i can use for this vehicle.

thanks for your time.

[BobND]

Master cylinder.

[Mr. Bone]

Hello Bob,

Thanks for the reply. Does your comment mean i replace the whole master cylinder? Is there a part within the cylinder i can replace. Do I get a reman., aftermarket, or oem replacement? Thanks .

[BobND]

Typically, a tiny return hole from the master cylinder bore up to the reservoir gets clogged with rust and crud.

You can probably get a kit for it, if the bore isn't too bad, and a new unit will be pretty pricey.

A quality rebuilt should do the job, but I have had some rebuilts lately that have not been of acceptable quality.

I guess it's up to you, and how much you care to spend.