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240 little brake feedback after bleeding a million times

ogamer777

ogamer777

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Joined
May 22, 2016
Location
New North Winchestersonville (PNW 425 gang)
i am back and this time i have bled the brakes a few more times and still have very little engagement of the brakes. It does stop the car, but, the brake failure light comes on every time. It will go off if i press the brake pedal about half way and let off.

I followed the Volvo greenbook sequence every time. No air came out of the nipples. I used a power motive system with upwards of 20psi each time i cracked a nipple loose.

Brake reservoir has always been near the max line. I don't see any leaks anywhere on the driveway or parts of the car.

New rebuilt calipers up front. Rears are the original ones. What am I missing here?
 
ogamer777 said:
i am back and this time i have bled the brakes a few more times and still have very little engagement of the brakes. It does stop the car, but, the brake failure light comes on every time. It will go off if i press the brake pedal about half way and let off.

I followed the Volvo greenbook sequence every time. No air came out of the nipples. I used a power motive system with upwards of 20psi each time i cracked a nipple loose.

Brake reservoir has always been near the max line. I don't see any leaks anywhere on the driveway or parts of the car.

New rebuilt calipers up front. Rears are the original ones. What am I missing here?
Click to expand...

Air trapped in the pressure reducing valves on the rear brakes. Jack the rear of the car up as high as you can and leave it overnight, then bleed again. Are the bleeder nipples on the front calipers pointed up? Sometimes the reman calipers are assembled incorrectly, see cleanflametrap website for more information.
 
VB242 said:
Air trapped in the pressure reducing valves on the rear brakes. Jack the rear of the car up as high as you can and leave it overnight, then bleed again. Are the bleeder nipples on the front calipers pointed up? Sometimes the reman calipers are assembled incorrectly, see cleanflametrap website for more information.
Click to expand...

Will do that.

They are pointed up. Went through that already heh
 
Be sure to tap lightly on the pressure valves with a hammer to dislodge trapped air. If it still isn't working well after that without any leaks. I'd suspect the master cylinder has failed.

Also I wouldn't go over 15psi with the motive bleeder. The higher pressure tends to make the brake fluid foam which interferes with removing air from the system.
 
Don't forget to bench bleed the new master. Also, if your fluid reservoir is OEM and in good shape you might want to keep using it. The new ones don't retain the cap very well as the threads are crap.
 
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