Disc brakes use more volume of brake fluid to actuate the brakes than
drum brakes with a wheel cylinder, so the there are 2 things
hydraulic-related to look at as well as a 2 mechanical possibilities.
The mechanical possibilities are pad to rotor clearance, and
booster-to-master cylinder pushrod adjustment. The calipers on some
vehicles have to be adusted to minimize brake pad to rotor clearance. I
would look into the caliper install and adjustment procedure from the
donor truck and follow that. If you replaced the master cylinder, the
replacement may have a slight difference in clearance to the pushrod
coming out of the power booster. Some Chrysler's have an adjustable
length pushrod. Check the depth on the old m/c to where the rod
contacts the m/c then compare it to the new one. Adjust it as
necessary. A trick would be to put a small ball of clay on the pushrod,
then push the m/c onto the booster, then remove it and check to see how
far the clay was smashed...
Going to hydraulics-you said the prop valve was new. What was it off
of? If it wasnt off of a rear-disc vehicle, then you need to get one
setup for such or get an adjustable valve. Remember you need more
volume in the rear, and the stock prop valve only sends a small volume
to the wheel cylinders and you need more with disc. The other item is
the master cylinder, which on some vehicles will have a larger volume
"stroked" internally to send more pressure or volume to the rear. You
may want to check the Chevy's stock m/c and see if there is any retro
upgrade or see if the new ram has 4 wheel disc and a m/c that may swap.
Hey, do the Rams have disc on the rear yet? This maybe something to
look into for those who havent...
Patrick
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:04:21 EDT