TC
No war here . The pistons on a caliper will retract at the same amount
if all is well . If the caliper is not centered on the rotor it will
cause the master cyl. piston to travel further
to obtain braking force . This is something I learned over 20 yrs ago in
a situation on a formula car that I had fitted a new brake system to .
I have also seen this problem in the shops with techs turning rotors on
European autos with ridged mounted calipers . They were use to floating
US systems & did not pay attention to what they were doing when turning
the rotors . They would get good brakes but with a low pedal . A
floating system does not care .
A ridgid mount system can not adjust for off set .
This is not something that I just thought up. It is my personal
experience & one of the few things that I've learned in the past 30 yrs
of turning a wrench for a living :)
Your Friend
Eric H
----- Original Message -----
From: "TC" <[EMAIL PROTECTED]>
To: "V-MAX TECH LIST" <[EMAIL PROTECTED]>
Sent: Tuesday, October 24, 2000 9:40 AM
Subject: Re: Brakes
> Eric,
> I don't want to contribute to a "brake" war but I have to agree with
> Sat Tara on this one. IMHO, (and we all know what opinions are worth),
> consider the following:
>
> Floating calipers are required for self alignment only when the
> piston/pistons are mounted on one side of the caliper. Our calipers
> have pistons on both sides and will auto align, (assuming that in a
> fully retracted position there is some clearance between the brake
> shoes and the surfaces of the rotor). When you only have
> piston/pistons on one side of the caliper then the caliper must be
> able to move in order to apply pressure equally to both sides of the
> rotor.
>
> Also IMHO ... Thomas has stated that his pistons relax an excessive
> amount when the lever is released. This is because the "check-valve"
> operation has been compromised. A master cylinder without a check
> valve, (on one in the line), can only be used on drum brakes. All disc
> systems must have some type of check valve mechanism to eliminate
> excessive clearance between the rotor and the pads, (usually about 3
> lbs in an automobile and 1 lb in a bike). Releasing the handle and
> gaining this much relaxation of the pads indicates that Thomas's check
> valve is not doing crap and as a result it will take excessive fluid
> movement to take up the slack and get any braking action when the
> brakes are re-applied.
>
> During normal operation the only thing that will push the pads away
> from the rotor is rotor run-out .. and when it is excessive you will
> gain lever travel to close things up before you begin to get any
> braking action.
>
> I have not had one of these master cylinders apart and I can not tell
> if the check valve is in there or built into the distribution tee that
> splits the line to each side of the front wheel ....... I am sure
> there must be a brake expert on the list that has had this experience
> before ... I suspect however that the little "flap" in the bottom of
> the master cylinder has something to do with this.
>
> Anyhow ... just my opinion ........
> campbell
>
> ----- Original Message -----
> From: "Eric Harnish" <[EMAIL PROTECTED]>
> Subject: Re: Brakes
>
>
> > Sat,
> > Ridgid mounted calipers will not compensate for a caliper
> > that is mounted off set to the rotor . Only floating calipers will
> > compensate for this condition . On a car with ridged mounted
> calipers if
> > you turn the rotors you must remove exactly the same amount from
> each
> > side or will give you a low pedal . The guys both changed their
> calipers
> > to non stock . Even a few thousands will effect braking performance
> &
> > master cyl. action . My stock brakes were
> > off on the right side by .005 . and the rear was .006 . People who
> ride
> > my bike always comment on the brakes .
> > My brakes are bone stock . I just detailed the system .
> > Now don't get me wrong the coefficient of friction is not increased
> just
> > the feel and I have immediate brakes at my disposal which instills
> > confidence in the rider .
> > Eric H.
> >
>
> > > Eric,
> > >
> > > These clearances should be self-adjusting.
> > > The only way there should be appreciable
> > > difference is if a piston seal is binding, holding
> > > the piston away from the pad.
> > > best,
> > > Sat Tara
>
>
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