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Re: Lift and rear brakes [Re: Anonymous] #1103235
03/25/17 06:35 PM
03/25/17 06:35 PM
M
MMeadows  Offline
Getting the Wheeling Fever
Joined: May 2016
Posts: 40
OR
I recently did a 2in lift and stared to have symptoms including noticed poor gas mileage and a rear rear right dragging caliper. I replaced the rear pads rotors and right caliper the problem is gone. Then my rear left caliper starts is stuck in the closed position. Im going to replace my rear left caliper.... but would a LSPV cause the symptoms I'm having? My front right brakes seem to be fine.

Also, I'm not the sharpest tool in the shed but i dont fully understand how a body lift would effect the LSPV if the spring is connected to the axle and the frame, the body lift is between the body and frame and would seem to have no effect on axle and frame distance?


97 Montero SR: 2in body lift. 33" KM2

Re: Lift and rear brakes [Re: Anonymous] #1103236
03/25/17 09:10 PM
03/25/17 09:10 PM
4x4Wire  Offline
Trail Leader
Joined: Feb 2000
Posts: 6,167
Lakeside, CA ***
Perhaps this will help explain:

Load sensing proportioning valves usually are adjustable, and must be adjusted correctly if they are to properly balance the rear brakes to the vehicle's load. The valve linkage is adjusted with the suspension at its normal height (wheels on the ground) and the vehicle unloaded. The adjustment bracket or linkage is then adjusted according to the vehicle manufacturer's instructions, which typically involves adjusting the linkage to a certain position or height.

Load-sensing proportioning valves are also calibrated to work with stock springs. Any suspension modifications that increase the load-carrying capability (installing helper springs, or overload or air-assist shocks, for example) may adversely affect the operation of this type of proportioning valve. Modifications that make the suspension stiffer reduce the amount of deflection in the suspension when the vehicle is loaded, which prevents the proportioning valve from increasing rear brake effort as much as it normally would. A defective proportioning valve, or one that is not properly adjusted, can also upset brake balance. If the rear brakes on a vehicle seem to be overly aggressive (too much pressure to the rear brakes), or the vehicle seems to take too long to stop (not enough pressure to the rear brakes), the problem may be a bad proportioning valve. Proportioning valves can be tested by installing a pair of hydraulic gauges (one on each side of the valve) to see if the valve reduces pressure as it should.

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