Brake problems once again -_-

[Lorenzo]

Well it seems every car i get im plagued with a break problem. Ok so on Friday i replaced all 4 calipers because 2 of the 4 were seizing so i said might aswell do them all before the other 2 sieze. So everything was good placed the 4 new ones on and began to bleed them. Everything went well pedal was firm when i was backing up. As soon as i start to go over 20 kmh and try to stop the pedal just goes straight to the floor before it stops. So figured okay air in lines we can bleed them again. So we bled them again today and made sure to get all the air out. It feels better now but still the pedal is terrible! Like when i push it down a touch i can feel the car stopping but then it goes away and the pedal just sinks till it starts to stop again. Its full on fluid, we never let the master cylinder go dry, we started from lr,rr,lf,rf and still i have a shitty pedal. We were thinking of bleeding the master cylinder but we couldnt find the bleeder valve. Any thoughts guys?
This is on a 2000 Monte carlo SS

 

[Bowiemontecarlo86]

The order should be rr,lr,fr,fl. U always start at the furthest point which would be right rear.also did u have your rotors resurfaced or at least scuff them up? If the rotors are glazed over they can give u a shitty pedal feel for a couple days.

 

[Lorenzo]

The order should be rr,lr,fr,fl. U always start at the furthest point which would be right rear.

Oops sorry thats what i meant. If i was looking at the car from the front then its lr But yea i did it that way and still a shitty pedal. I know it cant be the MC because the brakes were working perfect before, maybe a little tight due to the seizing but still good stopping power.

 

[Bonnewagon]

Sounds like a major leak, or bad master cylinder. If there are no leaks, then I'd replace that master. And don't forget to bench bleed it first.

 

[Lorenzo]

Sounds like a major leak, or bad master cylinder. If there are no leaks, then I'd replace that master. And don't forget to bench bleed it first.

Its not leaking anywhere though! The fluid level doesnt change in the MC, i dont see how the MC can be bad now, the breaks were working great before

 

[pontiacgp]

how were the brakes working great before when you had 2 seized callipers? Also there is no bleeder valve on the master, it's bled by routing the brake fluid back into the resevoir

 

[Peter]

are your bleeder valves facing upwards? if you switched sides perhaps then if your bleeders are facing downward, then you didnt install them right and you can't bleed them right

 

[DRIVEN]

Sounds like a major leak, or bad master cylinder. If there are no leaks, then I'd replace that master. And don't forget to bench bleed it first.

Its not leaking anywhere though! The fluid level doesn't change in the MC, i dont see how the MC can be bad now, the breaks were working great before

It doesn't have to be leaking externally. I've done brake jobs and just the act of bleeding the brakes can dislodge crud from the reservoir and get stuck in the cups/seals in the master causing an internal bypass. It can be intermittent too. Try bleeding it some more. If all else fails, replace the master.

 

[wonderboy24]

so you bled the all the calibers and they still don't feel right? the fluid level hasn't changed meaning loss. look around the master cylinder where it mounts to your booster to see if there is fluid there. so it could be the mc or the booster is bad that would make your brake pedal act up as well. even check to make sure the vacuum line is hooked up. just some ideas

 

[Indycutlass]

I second what driven said. The master can internally bypass. May not have notice because the calipers were bad.