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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