8-Cylinder Tech If you are one of the few with a V8 engine in your Ranger, or if you dream of a Ranger with a V8 engine, this is the sub-forum for you.

Brake Proportioning

Old 1 Week Ago
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Join Date: Nov 2013
Location: Stanford, NY
Posts: 42
Brake Proportioning

Not sure if this is the right forum, but here goes:
Background - '86 Ranger 5.0, AOD, 8.8 posi rear. New brakes front and rear. No tire stagger - same front and rear
Situation -Encountered a deer on the way home tonight doing about 50 mph. Braked hard to avoid it and the rears locked up WAY before the fronts and almost put us into the ditch. Pickups tend to do that, but this was extreme and I think the extra weight of the V8 contributed to it.
I'm thinking an ABS conversion is way over my head and am wondering if a master cylinder with adjustable F/R proportioning valve is on the market. Any experience? Thanks!
Old 1 Week Ago
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Join Date: Jan 2014
Location: Vancouver, BC
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Yes, rear brakes in pretty much any vehicle will lock up before the front, pickups are worse

Car and SUVs use 60/40 proportioning valves, pickups use 70/30

Ranger rear ABS only monitored the differential so you can still lock up one wheel

Yes, you can put on adjustable proportioning valve, you will need adapter fittings to match brake lines but not a big expense

Best to remove current proportioning valve to take it to auto parts to get adjustable valve and the fittings

There are also single line proportioning valves you can add to the rear brake line only
Old 1 Week Ago
Bird76Mojo's Avatar
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Join Date: Dec 2009
Location: Central, IL.
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If I was to attempt to add a proportioning valve to the system, I'd do a BUNCH of testing first to determine my average stopping distance. All on the same road, and try to shoot for the same conditions/temperature, etc.. Then test it after fitting and adjusting the valve.

It would be very easy to adjust the system to get the rear tires to nearly stop locking up, but at the same time adding a good bit to your overall stopping distance.

GB :)
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