wheel cylinder replacement
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Elder User
Joined: Apr 2007
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From: Winter Garden, FL
wheel cylinder replacement
Hey yall im about to change the wheel cylinders on my truck due to them being leaky and causing my brakes to be very spongy, i was wondering if yall could give me some advice on how to replace this, or if anyone has any articles or how to id really appreciate any info yall can give me, thanks
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Joined: Oct 2008
Posts: 1,145
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From: Hernando Ms
I suggest that when you go in,you replace the springs.and look really good at the shoes....usually when a brake cylinder is leaking,the fluid(highly corrosive) will soak into the brake material,and degrade it quickly.
Now to answer the original question....First be sure you have PLENTY of brake fluid,reason being is I suggest you flush the entire system going to the back....Removal of the cylinder itself is no problem,but you need to be sure you have a good closed end wrench that fits the bleeder valve snugly,as well as a good brake line wrench for the pressure line nut.
Disconnect the line,and remove the cylinder. Put the new cylinder on,and reconnect the pressure line. leave the bleeder barely snug.Put all the hardware back on,and adjust the manual adjuster to where the drum will just slip on.
Do the same for the other side.Fill the fluid resirvoir to almost full,and have someone push the brake pedal SLOWLY until there is no longer any air but be sure to tighten up the bleeder valve BEORE the pedal is allowed to go back up or air will be re-introduced into the line.You might need to loosen the bleeder nut a little for good flow.
I suggest a large pan/bowl under the drums to catch the fluid.
Once no more air is evident,tighten up the bleeders,and it should be good to go.
Now to answer the original question....First be sure you have PLENTY of brake fluid,reason being is I suggest you flush the entire system going to the back....Removal of the cylinder itself is no problem,but you need to be sure you have a good closed end wrench that fits the bleeder valve snugly,as well as a good brake line wrench for the pressure line nut.
Disconnect the line,and remove the cylinder. Put the new cylinder on,and reconnect the pressure line. leave the bleeder barely snug.Put all the hardware back on,and adjust the manual adjuster to where the drum will just slip on.
Do the same for the other side.Fill the fluid resirvoir to almost full,and have someone push the brake pedal SLOWLY until there is no longer any air but be sure to tighten up the bleeder valve BEORE the pedal is allowed to go back up or air will be re-introduced into the line.You might need to loosen the bleeder nut a little for good flow.
I suggest a large pan/bowl under the drums to catch the fluid.
Once no more air is evident,tighten up the bleeders,and it should be good to go.
Senior User
Joined: Oct 2004
Posts: 475
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From: Portsmouth,VA
Im not sure if you if possible to do it differently but I had to remove the rear brakes to replace the cylinder
just wanted to add a few tips from my experience, when I had to change mine the worst part was getting the break line flare fitting to connect to the cylinder. What I did was when I put the new cylinder on was to start threading the fitting into the cylinder and then bolted it on the wheel and then with a flare fitting wrench tightening up the brake line fitting, if not it was impossible to get the brake line square enough to thread it without cross threading.
Yes flush your brake fluid, and bleed brakes to allow new fluid to replace the old stuff, brake fluid should be clear looking not blackish.
just wanted to add a few tips from my experience, when I had to change mine the worst part was getting the break line flare fitting to connect to the cylinder. What I did was when I put the new cylinder on was to start threading the fitting into the cylinder and then bolted it on the wheel and then with a flare fitting wrench tightening up the brake line fitting, if not it was impossible to get the brake line square enough to thread it without cross threading.
Yes flush your brake fluid, and bleed brakes to allow new fluid to replace the old stuff, brake fluid should be clear looking not blackish.
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