Master cylinder problem

Bernie Benz b.benz at
Tue Jul 25 01:05:56 EDT 2006

So, at 69K and 15 years, you know nothing about the car¹s brake service
history and as yet IMO have done nothing substantial to establish a safe and
reliable braking system. Shame, I wouldn¹t ride with you!

With any new to you used car, especially of this vintage, brakes should be
your first priority. You must IMO, disassemble and clean the internal
hydraulics of all four calipers followed by a thorough flush of the complete
fluid system. If you wish specifics concerning this task, ask.


> From: "John S. Lagnese" <jlagnese at>
> I didn't use the mc, I just started to think more.
> I got the car last summer with 69K. The LF brake froze up first. I cleaned
> it up, bled it, even filing down the pad and bracket surface to give it more
> freedom to move. The rf brake started this, too. I repeated the procedure.
> The rf is the only one that sticks now. I never flushed the brake fluid.
> John
> ----- Original Message -----
> From: "Bernie Benz" <b.benz at>
> John,
> First, I don¹t think that your receiving the wrong master cylinder had much
> to do with ³causing the front passenger side brake to freeze up.³
> The MC has two independent circuits, Front is for the front wheels, rear is
> for rear wheels. Both circuits go thru the ABS hydraulic modulator, but
> that¹s a non issue relative to your Q, inasmuch as the lines to each front
> wheel are in parallel, tying to the same point on the top of the ABS unit.
> Lets start with the basics. How long has it been since, or have you ever
> cleaned out the front and rear caliper hydraulics? Flushed the fluid at
> least every 2 years since that full F and R hydraulic overhaul? If the
> answer is NO, Never, here is your starting point. Don¹t touch the MC!
> Bernie
>> From: "John S. Lagnese" <jlagnese at>
>> Hi,
>> I ordered and received my master cylinder. It turned out to be the wrong
>> one. I'll go back tomorrow to try again.
>> I don't see how this could cause the front passenger side brake to freeze
>> up. It displays all of the symptoms laid out by others. It doesn't happen
>> in
>> winter, occurs almost every time when the car is hot, and goes away when
>> the
>> mc cools.
>> What I don't see is if there are two lines coming out of the mc, how can
>> one, but not two wheels be affected?
>> Thanks,
>> John

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