If I'm replacing a master cylinder because of the issue where the pedal gets spongy or travels too far down on hot days only, do I need to change the fluid too? Or does the issue mean the fluid is fine but the cylidner itself is the problem? Does the heat affect the seals or something?

I ask because the 95 has its wheel cylinders replaced because one was leaking brake fluid. The fluid was changed as well afterwards. But the spongyness on hot days is still there so the master cylinder is going to be done next.

 

You will lose some fluid while changing the MC and will have to bleed the brakes (more fluid loss). You will need perhaps 1/2 pt of brake fluid.

good luck

 

If your fluid is old and looks like the color of there words I'm typing..then I would suggest retireing it to the re-cycle people...

On another note , I like this color of letters better...

WheelBrokerAng

 

A bad master cylinder will usually cause the brake pedal to slowly sink to the floor. Spongy brakes are usually caused by air in the lines. Who changed the fluid, and bled the brakes?