[W126 Coupe] brake bias adjustment

Divov divov at tiscali.co.za
Mon Feb 19 16:11:28 EST 2007


We tested the car on the public road.
This front lock up is occurring under 'normal' road conditions where the brakes aren't even particularly hot.
We tested it on the freeway and at 140kph (+-90mph) stomped on the brake pedal and she locks up (particularly one side) front wheels.
With the standard pads & set up this would never happen.
The lousy part about it while racing is that the brakes don't have a progressiveness.

>From not stopping particularly strongly, she goes into wheel lock-up which is really not what you want because you then have to get off the brakes & start again and - you are now flying into a corner much too fast...

It can all get very messy, very quickly.....

The way I race is I apply brakes strongly (at the limit of adhesion) at the last moment whilst still in a straight line and then gradually taper off my braking action for about the first 1/3 of the corner at which point I transition to ever increasing acceleration and, if all goes right, I'm at full throttle as I am exiting the corner. Its clean & fast.
To drive this way I can't have brakes locking up prematurely.

Maybe I must also change the rear pads to Ferodo Ceramic and re-bleed my brakes just for good measure.
At this point, the problem isn't over-heating brakes or brake fade - its too much braking to the front wheels.

So there isn't a valve arrangement which senses a weight transfer on the W126's? (or something like on many pick-up trucks?) which changes brake bias?
Thanks for your input.
Regards
Alec
----- Original Message -----
From: Jonathan Hodgman
To: Mercedes Coupes Mailing Lists
Sent: Monday, February 19, 2007 10:01 PM
Subject: Re: [W126 Coupe] brake bias adjustment


I would also consider switching to either a cryo treated rotor or some aftermarket rotor that's harder. MB uses soft pads and rotors & I'm sure your new pad was designed with a much harder rotor in mind.

You would need to buy a bias adjuster and mod it to fit out cars..although I'm a bit surprised you are having the problem.

Have you considered adding some ducting to help cool your brake system to help w/ the fade?

Jonathan
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