Soft Brakes

on brake drums , the drums wear out so the radius of the drum does not match the shoe radius. if YOU remove the drums and see that the top of the shoes are only wearing , then the drum is worn and will cause weak braking in the rear and also parking brake will also , not work good.

if the shoes were not adjusted to the point that they did not touch the drums then that is weird ,,, the brake cylinder could be damaged then leak,
drum IMO is too worn for that to happen.

Thanks for the info! I'm pretty unfamiliar with drum brakes. The left side was worse than the right as far as adjustment but I'll have to take the drums back off and take a closer look.
 
if the bottom of the shoes are worn can be the park brake cable sticking .. bottom is park brake.. top is the brake cylinder..

lift wheel off ground and work the park brakes see if the rear wheel is free with park brake off position , and you hear no noises..

Would that be consistent with the BOTTOM RIGHT being worn and the BOTTOM LEFT being normal? i.e. only half of the bottom of the shoes is worn?
 
I got my new SS brake lines and master cylinder last night. However the new master cylinder didn't come with a bleeding kit for bench bleeding. Disappointing. I guess because its OEM toyota from Camelback it's meant for dealerships or shops who already have the tools
 
Installed my new master cylinder from Camelback Toyota tonight

Also installed front SS brake lines, bent a new hard line, and replaced the rear rubber hose. I went through a lot of fluid since all the lines were open and drained out. Used new fluid to flush out the old fluid. I think I used at least 32oz because I had so many bubbles trapped.

I took it for a test drive only to check to make sure I have brakes.

Will take it for a longer drive tomorrow to see how it reacts...

Another member suggested my booster may be bad...how do I diagnose that, now that I know my M/C is new??

:rain:
 
Installed my new master cylinder from Camelback Toyota tonight

Also installed front SS brake lines, bent a new hard line, and replaced the rear rubber hose. I went through a lot of fluid since all the lines were open and drained out. Used new fluid to flush out the old fluid. I think I used at least 32oz because I had so many bubbles trapped.

I took it for a test drive only to check to make sure I have brakes.

Will take it for a longer drive tomorrow to see how it reacts...

Another member suggested my booster may be bad...how do I diagnose that, now that I know my M/C is new??

:rain:



Bleed your brakes one more time after it sat a while. At least open each bleeder for 30 sec with the cover off the master cylinder to remove any air that collected near the wheels.


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Bleed your brakes one more time after it sat a while. At least open each bleeder for 30 sec with the cover off the master cylinder to remove any air that collected near the wheels.


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Should I drive it a while then bleed again or how much time after it sits for a while?
 
I drive a little then bleed again, letting it sit over night in the garage.


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Bled them again. I have speed bleeders so air isn't supposed to go backwards through the bleeder valve. All 4 wheels had a couple tiny bubbles, and one of the rear ones had a few bigger ones.
Driving it a bit this weekend to see if it's better

Air in the ABS system has me concerned after reading other threads saying some people haven't been able to get rid of their soft brakes.
 
So I have concluded that there must be multiple things at play here

I drove the 4runner then let it sit overnight, then bled the brakes again.

The brakes respond better than before, so the M/C must have been on its last leg.

However, the brakes are still soft. I notice at low speeds or idle the brakes are less responsive. On the highway they are more responsive. Also, if I hit the brakes a few times they are more responsive than if I just hit them once. This makes me think my booster is shot? At the stop light after the 4runner is stopped, I can press the pedal further. I think this is the pressure escaping the booster? It doesn't remain firm.
 

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