| Author |
Message |
Henryk (Henryk)
Member
Username: Henryk
Post Number: 294
Registered: 8-2001
| | Posted on Friday, September 27, 2002 - 6:50 pm: | |
William: The original pistons are steel, not SS. When I discovered one piston frozen, it was solid......could not get it out.......it was rust on rust......far more than a little cleaning up!
My thought was, if one did it now, then surely others are to follow. But, of course, I may be wrong.
I will first practice on the caliper pistons I need to replace on a Range Rover (87').....my ATV.
Maybe I could design a piston, for the Ferrari, that will take standard CHEVY seals.....now THAT would be GREAT!!!!!!
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William Henderson (Billh)
New member
Username: Billh
Post Number: 17
Registered: 5-2002
| | Posted on Friday, September 27, 2002 - 10:30 am: | |
Just a thought...
why do you need to replace the pistons? when you order a rebuild kit, they send you new seals and dust boots and the like. is your piston scored or damaged in some way? usually some good scotch brite will remove any rust or patina off the pistons if they have been sitting for a long time... |
Henryk (Henryk)
Member
Username: Henryk
Post Number: 293
Registered: 8-2001
| | Posted on Thursday, September 26, 2002 - 9:32 pm: | |
William: The brakes on my TR are ATE. I believe they went to Brembo, later on, but don't know the year.....512TR?
I just got back from my machine shop class (a hobby).....talked with my instructor about caliper pistons. Next time a caliper needs rebuilding, I will make the pistons myself.....they will be from 316 grade ss round stock. It should be easy, and cheap.
Now I just need a source for the seals, without paying high Ferrari prices!!!!!!!
I am cosidering making the pistons, and installing them in the calipers that are OK, even though they don't leak......that way I could still use the original seals. I would call it preventative maintanence......these calipers ARE 14 years old!!!!!!
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William Henderson (Billh)
New member
Username: Billh
Post Number: 16
Registered: 5-2002
| | Posted on Thursday, September 26, 2002 - 11:56 am: | |
I believe Ferrari uses ATE brakes on the TR. they probably get their seal kit from them.
-Bill
86TR |
Henryk (Henryk)
Member
Username: Henryk
Post Number: 292
Registered: 8-2001
| | Posted on Wednesday, September 25, 2002 - 9:11 pm: | |
I just sent my front caliper to White Post Restorations to have it rebuilt.....turn around time is 2 days vs 6 weeks for Stainless Steel Brakes. Price was $320 from WPR, and $350 from SSB. Both advertise putting in new sleeves and ss pistons......but this is NOT accurate.
I wondered how they put in sleeves, with the appropriate grooves, and still keep the strength......this didn't seem right to me. Since I am a hobby machinist, it would take a lot of boring to make a sleeve big enough for the grooves, and still be strong.
After talking to the people at WPR, I found out, that, for my TR, they will only put in new ss pistons, with NO sleeves. This is because the seals are within the body of the caliper, and it is the piston that moves, hence, since the walls are not in contact with the piston, they do not have to be re-sleeved.....they will be cleaned up. If the seals are on the piston, then, they will re-sleeve......the original piston may, or may not, be replaced. They admitted, it would be too difficult to re-sleeve and re-groove the body of the caliper. This makes sense to me. It would appear that SSB would have to do the same. Hence, they only replace the piston, or re-sleeve, but NOT necessarily both....unless the seals are in the piston, and it is very bad....in which case, they would have to do both. It is much easier to machine a groove, or two, on the outside surface of a cylinder, than on the inside, and still keep it very accurate.
They will be putting new seals in, but not from Ferrari.....they get them from England.
This may all be a mute point, since, the caliper is warranteed for life, but, I just wanted to share my recently acquired knowledge. I thought that they always did both!
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