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Brake Master Cylinder ?


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ok so i put on the new brake parts and i happy that i go the stupid leak to stop 

 

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but now when i drive the truck up and down the road 

it won't stop the vehicle i have to pull the parking break to get the vehicle to stop

can anyone tell me what i did wrong ?

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is it soft? is it hard? you have to give us more info. did you bleed the lines?

He means the brake pedal. Does it go to the floor (or almost) really easy? Or does it feel stiff when you step on it?

 

Brakes have to be bled of air when you work on them because air is compressible. YouTube "How to bleed brakes". It's pretty much the same on any common car, truck, or suv.

 

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ok so here's what i did 

i had no clamp to bench bleed the MC 

so i just bolted the MC to the booster and connected rubber tubes to back feed the fluid back into the mc

i did that until the air bubbles stopped took about 30 minutes 

then i removed the rubber tubes and reconnected the metal brake fluid lines with a flare wrench and reconnect the vacuum tube hose to the booster

then i pumped the brakes like 20 times fully started the vehicle and tested them out

when i press them i get a medium amount of resistance but i can push it all the way down to the floor board 

it seems like there is not enough hydraulic pressure to move the brake pads 

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ok thats what i figured 

so i took the driver wheel off and tried un bolting the bleeder screw 

and it didn't budge at all i cleaned if off with a wire brush then sprayed it with WD40 

and all i managed doing was stripping it :(

so tomorrow i will try to weld a flat piece of metal to it and see if i can hammer it off 

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ok so here's what i did 

i had no clamp to bench bleed the MC 

so i just bolted the MC to the booster and connected rubber tubes to back feed the fluid back into the mc

i did that until the air bubbles stopped took about 30 minutes 

then i removed the rubber tubes and reconnected the metal brake fluid lines with a flare wrench and reconnect the vacuum tube hose to the booster

then i pumped the brakes like 20 times fully started the vehicle and tested them out

when i press them i get a medium amount of resistance but i can push it all the way down to the floor board 

it seems like there is not enough hydraulic pressure to move the brake pads 

 

You didn't bleed the lines to the wheels. Just pumping the peddle doesn't do anything for you.

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ok thats what i figured

so i took the driver wheel off and tried un bolting the bleeder screw

and it didn't budge at all i cleaned if off with a wire brush then sprayed it with WD40

and all i managed doing was sripping it :(

so tomorrow i will try to weld a flat piece of metal to it and see if i can hammer it off

Careful welding to brakes. Welding fluid is pretty flammable stuff. I've had success in the past removing the wheel and carefully heating the bleeder screw (just the screw, not the caliper in disc or brake cylinder on drum) then removing it very slowly with vise grips. After it breaks free let it cool. You'll need new bleed screws if you do this though.

 

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ok thats what i figured 

so i took the driver wheel off and tried un bolting the bleeder screw 

and it didn't budge at all i cleaned if off with a wire brush then sprayed it with WD40 

and all i managed doing was sripping it :(

so tomorrow i will try to weld a flat piece of metal to it and see if i can hammer it off 

 

Don't weld. Use vise-grips. And go easy -- if you break off the outer part, then you'll have to buy a new caliper (or wheel cylinder, depending on which end you're working on).

 

In fact, wheel cylinders aren't expensive. Considering the age of your truck, it might not be a bad idea to just buy new wheel cylinders and start fresh.

 

And don't use WD-40 for penetrating oil. That's not what it's for, and it doesn't work. Use PB Blaster, or (even better) Kroil -- if you can find it.

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ok thats what i figured

so i took the driver wheel off and tried un bolting the bleeder screw

and it didn't budge at all i cleaned if off with a wire brush then sprayed it with WD40

and all i managed doing was sripping it :(

so tomorrow i will try to weld a flat piece of metal to it and see if i can hammer it off

Don't weld. Use vise-grips. And go easy -- if you break off the outer part, then you'll have to buy a new caliper (or wheel cylinder, depending on which end you're working on).

 

In fact, wheel cylinders aren't expensive. Considering the age of your truck, it might not be a bad idea to just buy new wheel cylinders and start fresh.

 

And don't use WD-40 for penetrating oil. That's not what it's for, and it doesn't work. Use PB Blaster, or (even better) Kroil -- if you can find it.

I have had good luck using a 50/50 mix of transmission fluid and paint thinners in a spray bottle to loosen seized bolts.

 

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i have been trying to use vise grips and i can't get it to budge at all

i think I'm going to just heat up the bolt and that should pry it free

 

Are you working on a caliper or a wheel cylinder? Keep in mind that the bleeder screws are brass, so they are easier to mess up. At least for the wheel cylinders, I think you shouldn't waste any time trying to free up stuck bleeders. Just buy new wheel cylinders and install them. Your master cylinder was so bad it was leaking, so I would expect the wheel cylinders to be in equally bad condition. Rear wheel cylinders are $10 from Autozone -- new.

 

Their remanufactured front calipers are $21.99, and they have a lifetime warranty. You decide how much effort you want to put into something that probably needs to be replaced anyway.

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i may have to buy new calipers hopefully i don't because the original ones work and they say AMC on them so i want to keep then because they are original

You can buy rebuild kits or new ones and transfer the seals. If you're careful :D

 

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i may have to buy new calipers hopefully i don't because the original ones work and they say AMC on them so i want to keep then because they are original

You can buy rebuild kits or new ones and transfer the seals. If you're careful :D

 

 

 

Rebuild kits won't help much if he snaps off a bleeder screw in the caliper.

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Good News guys i got the bleeder screw out 

i found out that if you allow plenty of heat and give it hard hits with a hammer the vibrations will break it free and allow you to turn it 

 

now i just got to go buy new bleeder screws 

 

Excellent. Thanks for the update.

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i may have to buy new calipers hopefully i don't because the original ones work and they say AMC on them so i want to keep then because they are original

You can buy rebuild kits or new ones and transfer the seals. If you're careful :D

 

 

 

Rebuild kits won't help much if he snaps off a bleeder screw in the caliper.

 

 

That's what an easy-out is for.  Or weld a nut onto the broken bleeder...  I've broken more than a few off and never trashed a caliper because of it.

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