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Post by dads442 on Aug 8, 2018 11:30:03 GMT -5
Ok ...not sure if this is the right place or not to ask, but since this is not a 64 or 65 question thought I would ask here anyway...we have a 69 Cutlass S with disk drum brakes...just below the booster is the metering valve...it leaks so the first thought is to just replace it and they are available... In later years, I think starting in 71 or 72 GM started using a "combo Valve" that combined the metering/proportioning block and distribution block into one...question I have is it possible to "upgrade" to this "combo" valve on the 69 or is it best to leave well enough alone and just replace the metering valve??? Thanks
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Post by joepadavano on Aug 9, 2018 13:15:21 GMT -5
The 1967-70 A-body cars do not use a proportioning valve - the front/rear braking balance was set by carefully selecting the wheel cylinder relative sizes. The metering valve simply delays application of the front brakes long enough to allow the "slop" in the rear drum brakes to be taken up as the pistons move outward. The combination valve used first in the 1971 model year incorporated the metering valve and the proportioning valve in a common housing with the distribution block. If the brakes in your 69 are working correctly, there is no reason to replumb the system with a combo valve.
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Post by dads442 on Aug 9, 2018 16:23:17 GMT -5
Thanks Joe for the reply...
My son read somewhere where some had upgraded to the newer valve...not sure why but seems like a pain to re plum when you can simply replace the metering valve and bleed the system and be done...brakes work fine so I imagine we will keep it as it is...just checking to see if there was any advantage to changing it...
thanks again
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