more brake issues

12vcummins59 · Dec 4, 2016

After replacing pads and shoes and bleeding my brake system the brakes aren't working very well at all. The brake pedal is stiff and if i stand on it they'll slow the truck down a little bit, but not very well at all. I did adjust the rear drums after changing everything. After driving around the block while dragging the brakes the whole time they were very hot but still not working very well. Please help

crazzywolfie · Dec 4, 2016

did you change any brake lines, calipers or wheel cylinders when doing your brake work?

12vcummins59 · Dec 4, 2016

crazzywolfie said:
did you change any brake lines, calipers or wheel cylinders when doing your brake work?

Nope just pads shoes and bled the lines

crazzywolfie · Dec 4, 2016

you shouldn't have had to bleed the lines if you only replaced the shoes and pads. do the brakes kind of feel the same with the truck off as it does with it running? if so i would be checking for vacuum at the brake booster.

12vcummins59 · Dec 4, 2016

crazzywolfie said:
you shouldn't have had to bleed the lines if you only replaced the shoes and pads. do the brakes kind of feel the same with the truck off as it does with it running? if so i would be checking for vacuum at the brake booster.

They do feel the same, also like they work a little bit better at higher rpm

crazzywolfie · Dec 4, 2016

i would be checking for vacuum at the brake booster or for vacuum leaks.

12vcummins59 · Dec 4, 2016

Thank-you will try that

dudeman2009 · Dec 4, 2016

There is also the possibility that when you were backing the caliper pistons back in, if you didn't open the bleeder screws and backed them up too fast, you shoved some crud into the master cylinder and now its jammed with rust or something.

I'd check the brake booster line first, but if they were working before, and now are not, you may be in for an unpleasant surprise.

12vcummins59 · Dec 4, 2016

What happens if it is crap shoved into the master cylinder??

dodge dude94 · Dec 4, 2016

You have to replace it......
And flush the entire system.

12vcummins59 · Dec 4, 2016

Just got the thing ready to drive after 3 months,drive it once now get to deal with this I guess I'll start by checking the cheap easy things then go from there

dudeman2009 · Dec 4, 2016

Just for future reference. If you cant get the bleeders open and have to back the pistons in, just take it slow. I never open the bleeders unless the car is new or the calipers are on a vehicle that hasn't seen a Michigan winter. It usually takes me 3 minutes to fully back each piston in, but on the hundreds and hundreds of brake jobs i've done, only a handful have ever had problems.

12vcummins59 · Dec 4, 2016

dudeman2009 said:
Just for future reference. If you cant get the bleeders open and have to back the pistons in, just take it slow. I never open the bleeders unless the car is new or the calipers are on a vehicle that hasn't seen a Michigan winter. It usually takes me 3 minutes to fully back each piston in, but on the hundreds and hundreds of brake jobs i've done, only a handful have ever had problems.

I didn't open the bleeders but didn't go fast either, I would takes couple turns on the c clamp let it sit a few seconds then take another turn or two. I didn't have this problem before the I did the brakes either

12vcummins59 · Dec 5, 2016

Today I messed with the brakes with the truck running and with itb idleing there is a constant hissing noise from the master cylinder area but when the brakes are being pushed the noise goes away. The noise only goes awayvwhen the pedal is going dow but if I'm holding them all the way down and the pedal is not moving the hissing noise comes back. Vacuum leak maybe?

crazzywolfie · Dec 5, 2016

sounds like a bad power brake booster to me. you may want to look around and hope one of the vacuum lines is leaking it don't sound like it to me

12vcummins59 · Dec 5, 2016

crazzywolfie said:
sounds like a bad power brake booster to me. you may want to look around and hope one of the vacuum lines is leaking it don't sound like it to me

With more looking around the noise is coming from down near the power brake vacuum pump, be nice if it was just a loose hose or something. It's dark and too cold to look now

crazzywolfie · Dec 5, 2016

hopefully it is that simple.

12vcummins59 · Dec 6, 2016

Got her fixed, just a disconnected hose that was the vacuum leak!

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