torbjorn.forsman at gengas.nu
Sat Nov 25 17:32:45 CST 2006
But is this brake proportioning problem really due to a bad design from
the beginning? Or might it be that parts in the pressure regulator wear
out or get stuck as time passes? At least, the brake proportioning must
have been acceptable when the car model was presented to the authorities
for type approval.
If the pressure regulator is connected to the rear suspension in order
to permit a higher brake pressure when the rear of the vehicle is
heavily loaded, then there are often lots of mechanical parts - links,
springs etc - that may come out of order or need adjustment.
A good mechanical pressure regulator with an integrated accelerometer
was used on some VW buses (Vanagon/Kleinbus/Transporter) during the 70's
and perhaps later too. Take a look at that unit, it is probably easily
found at breaker's yards.
dan at w3eax.umd.edu wrote:
> Hi Guys (and gals),
> I was wondering if anyone has ever played with making their own
> proportioning valve based on ABS. I have a Mk1 MR2 and the car uses a
> pressure regulator to control maximum braking on the rear brakes to
> prevent them from locking. A number of people have commented that the
> regulator is set poorly and causes the rears to be doing very little
> when the front are nearly locked, thats very unfortunate in an MR2 which
> has most of its weight over the back.
> I was thinking it'd be neat to try putting in an ABS modulator valve, a
> couple pressure sensors, and a 2 axis-accellerometer, which would keep
> the rear pressure at some proportion of the front pressure by using the
> ABS valve block. The accellerometer would be able to detect tilt in the
> car and adjust the pressure proportioning as appropriate.
> Anyone ever try anything like this?
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