Per Revington;
They are all failing now because of manufacturing processes, age and
people up grading to stickier-wider tires.
I have known of several people who have experienced brake fade just with
spirited driving in mountain regions.
Per Dave Massey;
Revington was talking about the axles. Most of the people who have
upgraded to the rear disc brakes have up graded the axles also. However
I have been running the disc brakes with the stock rear axles for 8000
miles with no problems. The car now has 284000 miles total.
Since the front brakes do 75% of the braking on a car that has a 52/48
weight distribution then 23% of the rear braking potential is lost. What
I have tried to do is recover some of that by balancing out the total
braking system,
Mike Munson
-----Original Message-----
From: Dave Massey [mailto:105671.471@compuserve.com]
Sent: Monday, January 13, 2003 1:52 PM
To: R. Ashford Little II
Cc: Mike Munson; Triumphs@autox. Net; 6-Pack
Subject: FW: TR6 rear brakes
Message text written by "R. Ashford Little II"
>Hmm, Revington seems to imply that beefing up the rear brakes could
lead
>to premature rear axle failure. Comments?
>
>R. Ashford Little II
>-----Original Message-----
>From: Martin Jay [mailto:martin@revingtontr.com]
>
>>I'm fairly sure there's nothing commercially available,we looked @it a
>>while ago & it wasn't viable.
>>The main constraint was the weakness of the standard rear hub units,
>>there seem to be an ever increasing number of failures.
>>Also, unless your circuit racing, we dont generally need more braking
on
>>the back.
Did he say that the rear wheel bearing hubs are breaking or the cast
aluminum trailing arms are breaking. Since the brakes work directly on
the
rear hubs and the brake rotor (or drums) it would seem on the surface
that
the axles themselves are not involved. But after a little thought it
occurs that drum brakes work more or less equally on either side of the
axle resulting in very little offset force on the bearings.
Disc brakes, on the other hand, have all the brake pads on one side of
the
axle. When braking, the pads grab the rotor and apply a tangential
force.
To prevent the axle from rotating about the pads the axle bearings mush
apply an approximately equal force in the opposite direction. This
force
could well excede the force resulting from the weight of the vehicle
resting on the bearing and with the double taper bearing setup used this
will put tension on the hub shaft - which are known to break. (I have a
broken on in my garage if you would like to see on)
Or is it because those who opt for this conversion are more likely to
hot-foot it around town (or track) than those with OE brakes?
But I agree with his last statement. Since the front brakes do 75 % of
the
stopping, rear disc brakes are like gilding a lilly.
Dave
|