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post #1 of (permalink) Old 12-29-2000, 02:49 PM
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1988 Samurai

I have notice something strange since I have overhawled my rear drums. When I brake I usually press the brake downshift and pump the brake again. What is happening is that the brake pedal on the first pump sinks significantly lower than on the second pump. Why is that?


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post #2 of (permalink) Old 12-29-2000, 03:30 PM
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Re: Brakes

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post #3 of (permalink) Old 12-29-2000, 06:50 PM
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Re: Brakes

It sounds like you have AIR in the system. I had the same problem when I changed my rear wheel cylinder. Bleed the brakes, should take care of your problem. It did for me.

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post #4 of (permalink) Old 01-01-2001, 11:48 AM
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Re: Brakes

I've been told that sometimes there is an air pocket in the rear cylinders. You can elliminate it by using a "c" clamp and pressing the cylinder pistons inward. Then bleed as usual and this will take care of it if this is your problem. Hope this helps...

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post #5 of (permalink) Old 01-01-2001, 02:11 PM
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Re: Brakes

Sounds like air in the system. You can also “reverse bleed” the system. Take a clean oil can, the kind that has a thumb lever that you pump. Fill it with brake fluid, attach a clear rubber hose to the end of the discharge tube. Pump all of the air out of the clear tube and attach it to the bleeder valve. Just open the bleeder valve a small amount and pump the oil can. Have someone check the brake fluid reservoir and make sure it doesn’t over flow. The person watching the reservoir will see air bubbles coming up in the fluid. When the bubbles stop, your ready for the next cylinder.

Will be a bit messy ‘cause there will be some leakage from the bleeder valve. But, it works if all else fails. Works great on hydraulic clutches too.

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post #6 of (permalink) Old 01-01-2001, 03:01 PM
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Re: Brakes

air in the brakesystem seems the most obvious, but what it also could be is that the brake shoe slack adjusters are not working properly. So when you release the brake pedal the springs between the shoes can pull the shoes too far inwards. When this happens and you start braking the first brake pedal push cannot shift enough braking fluid needed to have the shoes make contact with the drum again, if you pump a second time a supplementary amount of fluid will be added and then they will start working. If your parking brake is inside your drums (not when you have an e-brake on the transfer) you can try to pull up the handbrake one click, this prevents the shoes from being pulled inwards too much and takes over the function of the slack adjuster and the rear will start braking instantly.
hope I didn't make it too complicated.


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