brake master cylinder

[kidd666]

I need help with my brakes. The master cylinder was leaking brake fluid so I went to replace it and Napa autoparts has a couple different ones. So I picked one that he said was common on these trucks and its not working out. I put it on and blead the brakes go to start it up for a test drive and the pedal sinks to the floor. I'm thinking I got the wrong one. How would I tell what type of brake system/ master cylinder would I need? Oh and when I start the truck the brake light stays on. I really need help quick please

 

[DRAGGIN95]

I don't remember what year your truck is?

 

[shelbyt.67]

Did u bleed the RWAL? If not, thats a real pita part of our trucks. Alot of us have removed them. Makes fer much better pedal feel and response.

 

[Pierced]

Did you bench bleed the master cylinder before installing it?

 

[GMCTRUCKS]

Did you bench bleed the master cylinder before installing it?

That's what im wondering as well. If not look on YouTube how to do it.

 

[Swims350]

I'm thinking he did not, he said he put it on and bled brakes, never said bench bled then installed etc.

good luck. I removed my RWAL and I can't get mine bled without it. it's being a real pain.

 

[shelbyt.67]

I'm thinking he did not, he said he put it on and bled brakes, never said bench bled then installed etc.

good luck. I removed my RWAL and I can't get mine bled without it. it's being a real pain.

Have u checked yer rear cylinders fer leaks?

 

[Swims350]

both are brand new, and when I pump the pedal it gets hard and stays hard, then when you let off and hit it again it falls to the floor.

 

[shelbyt.67]

That's a head scratcher.

 

[kidd666]

I did bench bleed it first. What is the rwal?
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