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Eleminate load sensing brake valve? Change proportioning valve?
On my 86 F250, the brake performance has been poor to say the least. After replacing the rear brakes, perfomance was still poor, and it seemed the rear brakes weren't doing much work. Using an 87 rear brake hose and a 1/4 to 3/16 adaptor, I elemenated the height sensing valve on the rear brakes since a new one wasn't available. Big suprise! I get rear wheel lockup in a panic stop now. I think the original proportioning/ residual pressure valve may be poor anyway, not to mention it was calibrated to use the height sensing valve.
The options I've come up with are find a source for a new OEM valve, and then add an adjustable proportioning valve, or find a proportioning valve calibrated to work without the height sensing valve. Anyone have any experience with this?
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Mine: 91 F250 Reg Cab 4x4 5spd 7.3IDI 4.10LS 145,000 miles. Banks Sidewinder 92 D60 F axle w 97 brakes and Powerlock. Lift: about 4" over stock 250. 33x12.50x16.5 Pro Comp MTs Magnaflow 12" muffler. Sees dirt everyday. Used to haul hay, wood, feed cows, check fence.
Hers: 96F250 CCSB 7.3 PSD 4x4 5spd 3.55 LS 190,000 miles. Puchased 7/03, Looked for a 5spd CCSB for a year!Dana 60 front axle, at stock F350 height (for now) Energy Poly bushings, Bilsteins, 305/70/16 Pro Comps on 16x10 Weld Outbacks, AFE Pro7,TYMAR 3x3.5x4 downpipe,TYMAR 5" straightpipe, gutted EBV, IH Non EBV pedistal,New Alliant AC Injectors,(stage 1)Cal reg kit, SBC Con O clutch, permenent clutch bushing fix, AC mod with a different twist, AMP Powersteps with custom brackets and wiring(one of 2 OBS trucks with them according to AMP) Line of Fire. Sees dirt everyday.
My Company pickup: 86 F250 6.9 C6 320,000 miles Co trucks 5 89 to 94 IDI's, plus about 50 more diesels.
Diesel Mechanic 28 yrs
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