HELP: 93 Toyota Corolla vibration problem! (2025 Update)

There's that reading comprehenxion problem again, huh ? Were do you see brake hoses metioned above ?

If you bothered to read the entire post you would have seen what I recomended, here's the part you snipped:

He has taken the car to someone who calls themself a mechanic, but is not capable of finding the problem OR fixing the vehicle. He needs to take the car to a REAL mechanic who is capable of DIAGNOSING the problem and FIXING the car. He has checked everything on the car EXCEPT the brakes and even had him replace what was probably a perfectly good set of tires claiming they were "defective". Sound like he is taking it to a tire store flunky instead of to a real shop.

You would think the inreased airflow would help cool it, no ?? Especially on an open wheel car!

Once in a while, yes.

How does a tire get "bent" ????

Nope, I've never seen a bent tire before.

I watch NASCAR racing all the time and I've never seen a bent tire there either.

Oh let's see, how about by being hit by another car? Hitting the wall? Ever seen THAT happen? How about hitting pieces of another car from a wreck?

Yep you WIN Mike it can ONLY be the brake hoses there is NO other possibility YOU WIN! REPLACE THE HOSES AGAIN!

If the problem is easily repeatable then it should be easy to determine:

A) Which brakes are dragging (is it just one?). B) Does the hydraulic cylinder at the wheel have hydraulic pressure.

At this point your conclusion that it is affecting only the one wheel seems likely to be wrong. Have you noticed any pull to one side when braking or when the problem occurs?

-jim

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I would also check the freeplay in the pedal, make sure you have enough. Also make absolutely sure that you do not have a wheel bearing issue. check your list as well though those are all possibilities.

good luck

nate

Seems a bit doubtful there was anything at all wrong with the master cylinder. If there was that big of chunk of rubber missing from in the MC that would have produced a noticeable symptom (sinking brake pedal). They eventually found the problem after the master cylinder was replaced - that doesn't mean the MC was the cause or even a contributing factor. More likely whatever the "debris" was causing the blockage came from somewhere else. Since the problem started after doing the first brake job the debris probably came from the direction of the wheels when the fluid was forced back by retracting the wheel pistons.

-jim

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Glad you found it and let us know what had happened. Simple replacement of the master cylinder would have, I guess, availed little or nothing without going further and dealing with the proportioning valve. Congrats.

JESUS CHRIST!!!!!!

See what I mean?

with 265k miles on it.  There is a

Glad to hear the problem is fixed; however, can someone explain to me how this fix is possible? I have never seen a proportioning valve that in any way affected the operation of the *front* brakes, is there something I haven't seen before on the prop valve of the OP's car?

As an aside, if there's rubber debris in any brake component, it's

Also, this whole exercise gives me an excuse to mention that I like to change the brake fluid in my vehicles every couple years, whether or not the FSM recommends it. This not only reduces corrosion but flushes all debris like this "downstream" and out, and most of the corrosion/rubber failures tend to happen closer to the wheels.

nate

Whatever howling you did or you thought some one else did that didn't fix the problem. Obviously a blockage blockage in the line to the wheel that had the problem is a reasonable explanation for the symptoms. Replacing the Master cylinder and proportioning valve may have resulted in a solution, but there isn't any clear evidence that there was anything wrong with those parts.

-jim

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Nate, The valve is weird in the 93 corolla. Basically, a line goes from the master cylinder DIRECTLY to the front driver's side wheel. Then a 2nd line comes from the master to the valve, which then proportions the pressure to the passenger side front wheel and BOTH rear wheels (you read that right... 3 wheels on the valve). Weird eh?

-Jon

I'd say so! but thanks for the reply, your explanation of the fix makes more sense now, esp. as I recall you stated that the problem appeared to be specific to the RF wheel. I wonder what the Toyota engineers' reasoning for doing this was?

nate