[phoenixdawg]

Ok I changed everything associated with brake system. Master, booster, pro valve, rotors, calibers, etc. Front brakes work great, getting plenty of boost, but the rear brakes are not working right, lines are crimped, I am at a loss on what to do, any suggestions?

[baz67]

Is it the correct size master? What size tires are on the back?

Brian

[WildBillyT]

Rear disc or drums?

[deerhunter]

Originally Posted by phoenixdawg

Ok I changed everything associated with brake system. Master, booster, pro valve, rotors, calibers, etc. Front brakes work great, getting plenty of boost, but the rear brakes are not working right, lines are crimped, I am at a loss on what to do, any suggestions?

What do you mean by 'rear lines are crimped'? If you mean crimped as in flattened you need new ones. The rubber part that goes to the wheel cylinder can come apart inside and block the fluid pressure. Did you change or rebuild the rear wheel cylinders? Did you bleed them good? If they are drums can you hear them moving while someone else pump the brakes slowly? There is more to check if they are drums but see if anything here works. Good luck.