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Brake Problem & Floor Mats
From: Debu Purohit <firstname.lastname@example.org>
> I'm running into a bizarre brake problem on my 1992 100S.
> The brakes groan very loudly when I step on them (sounds like
> a large truck is coming through). However, this
> happens only when I'm reversing at slow speeds such as backing out
> of my driveway or into a parking space. I haven't been able to replicate
> the sound when I'm going forward.
BTSTDTGTS. (Been There Seen That Done That Got The Shirt)
> The mechanic says that my rear pads and rotors have to be replaced.
> That part I knew. However, he adds that there are lots of
> iron filings around the ABS sensor which are causing the
> ABS to kick in. His rationale for the sound occurring only in reverse is that
> the metal filings have all lined up in one direction, because most
> of the driving occurs in that direction.
> Does this make sense?
NO!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! He wants to get in your
pocket and it sounds like he doesn't know this car.
> (I have never felt
> the brake pedal pulse when I'm reversing at less than 5 mph.
> Although, I have to admit that I've never tried reversing at
> higher speeds.) Anyway, the mechanic recommends changing the rotors
> and pads and cleaning out the sensors to attempt to solve the problem.
> Any thoughts (especially because he wants to charge $500)?
YES. If the pads are not worn out, I bet YOU can fix this for about $3!!
My 1990 200 was doing the same thing. What's happening is that your
worn pads are vibrating on the rotors when you back up and apply the
brakes lightly. All you need to do is pull the bottom bolt from the
rear calipers, rotate them upward (leaving the pads in place) and
lubricate the back of the brake pads with hi-temp grease designed
specifically for disc brake pad applications. Re-assemble, coat the
bolt you removed lightly with medium grade Loctite, re-insert and
torque to specs. Total time per side: about 20 minutes.
I've heard more than one do this, usually when the pads are at least
50% worn and the lube has had long enough to melt and run out. In
the short run (for the rest of the pads' life) a good layer of lube
will dampen the vibration and eliminate the sound problem.
If the pads are truly worn out, you'll have to replace them and the
rotors - but DO NOT pay $500! You can buy the parts for this
from Blaufergnugen for about $150, and the rest is labor. The only
difficult part of the job is turning the brake pistons back into the
calipers, and I made a tool out of a large socket (Cost = $70 for the
bench grinder I'd wanted but finally had an excuse to buy, hee, hee).
(Lessee....$150 = @4.71 qewsas, right Dave?)
Any competent mechanic can do this job for the parts cost plus NOT
more than 2 hours labor. With the correct brake tool to turn in the
piston, it might be done in less than one hour!!
> From: email@example.com
> A few times over the last six months or so, I've had my gas pedal
> get stuck beneath my driver's side floormat.
> It takes a really good tromp on the gas pedal to make it stick,
> and then when I lift my foot, the pedal is stuck down and doesn't lift.
> When this happens I experience *unintended acceleration*!
OK - you can make your own hooks to hold the mats in place. Take a
coat hanger and cut two 4" sections, then bend them into "S" hooks
which actually look like a "Z".
Take one side (hook) of the Z hook and stick it thru the carpet on the floor
- use the other hook of the Z to snag the floor mat and hold it back
from the pedal. Many mats have loops of fabric on their back to hold
these hooks...you could sew on some made of nylon fabric or even some
nylon cord. Position the mat where you want it - about 2" further
away from the pedal. Problem solved.
Al Powell Voice: 409/845-2807
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