Brake bias is not as advertised

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ds32928
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Brake bias is not as advertised

Post by ds32928 » Sat Mar 24, 2018 11:32 am

Supposed to be 60% rear/40 front, but ever since Ive owned this used Freestyle, it's like it's
75 %front/25rear. Ive noticed that anti-lock braking comes on, (can only verify the front anti-lock, because of steering wheel feedback), with slush, not ice, on the street, when braking to a stop, from 10mph. Vehicle nose dives with any brake application, harder on the brakes = more nose dive. Just had the front pads replaced, I know they aren't dragging, because vehicle coasts well, just like before, and wheels dont get hot after a long drive, but you cant touch the rotors because of the heat after driving without using the brakes other than slowing to turn a corner and then slowing down again, to turn into the driveway and stop. At the same time the rear rotors are just barely warm.

I had the rear pads and rotors replaced 30,000 miles ago, and feel no ridge on the outer edge of the rotors from wear, very little pad wear as far as I can see, just looking through the wheel openings.

Where do I start? Is the brake bias done in the master cylinder, or is there a Brake Proportioning Valve in that brake line manifold I see right in line after the master cylinder output lines?


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Splicer
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Re: Brake bias is not as advertised

Post by Splicer » Sat Mar 24, 2018 1:59 pm

Brakes have always been front main, rear control, nothing surprising. This is why front brakes wear faster than rears do.

Sounds to me like you desperately need new struts all around. Your braking performance will improve 110% guaranteed. Don't touch the brake system itself.
2007 Freestyle Limited FWD 297,000+ miles 8)
2004 Escape XLT FWD 251,000+ :)
2006 Escape Hybrid AWD 121,000+ :mrgreen:

ds32928
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Re: Brake bias is not as advertised

Post by ds32928 » Sat Mar 24, 2018 2:49 pm

Thanks, but its 60rear 40 front. Rears wear out first, when bias working as designed, on a Freestyle.

viewtopic.php?t=5208#p35612

and a few other posts.

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jas88
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Re: Brake bias is not as advertised

Post by jas88 » Mon Mar 26, 2018 5:45 am

I've put over 400K miles on 2 FS, I do all my own maintenance, and the rears do NOT wear out first.
2006 SE Silver w/Slate cloth

ds32928
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Re: Brake bias is not as advertised

Post by ds32928 » Mon Mar 26, 2018 6:43 am

To see if my too hot to touch front rotors are normal after city stop and go driving, after you stop and get out, are your front rotors too hot to keep your finger on, and the rear rotors just pleasantly warm? Ive already determined that my front brake pads are releasing, and not the cause of the heat from stuck pistons. I don't have one rotor that get hotter than its matching rotor on the other side.

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jas88
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Re: Brake bias is not as advertised

Post by jas88 » Wed Mar 28, 2018 5:34 am

When I come off the road, all my rotors are too hot to keep your fingers on.
2006 SE Silver w/Slate cloth

ds32928
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Re: Brake bias is not as advertised

Post by ds32928 » Wed Mar 28, 2018 6:18 am

Thanks. My rear rotors are only warm, I cant say hot. 30,000 miles on the rear pads and rotors since replacement, and I see no wear on the rotors, and its hard to see that the rear pads have worn much, if at all. 159000 total miles so yes, worn struts may come into the equation. As the front begins to dip down a little from appling the brakes, weight transfer makes the fronts do a lot more of the work. I get that. Weight transfer when braking and static weight loading, has a lot to do with brake bias. Vehicle doesnt bounce again, after hitting a dip at a intersection, so dont think the struts are worn out junk.

Its usually just hauling a driver, but maybe if a few people were in the second and rear seats, the static loading may lessen the dynamic weight transfer to the front, and then the rears work more than when the vehicle static weight is just the driver and the engine.

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