| Author | Message | ||
     Glen Poolen Frequent User Username: wgipps Post Number: 273 Registered: 03-2018 |
howday again. Brake calipers - i know there are a few people who do them professionally. Are there any in Australia? I think Bristol Tool Works is one who does them in Canada, and I also beleive he powdercoats them as part of his service. Anybody else do anything similar? TIA GP | ||
| David Gore Moderator Username: david_gore Post Number: 4036 Registered: 04-2003 |
Glen, Rebuilding the callipers is well-within the capabilities of an average home mechanic if you have access to the right tools including a "flapper brush" mounted on an electric drill to lap the bores of the callipers and the outer surface of the pistons before reassembling to help the new seals settle-in leak free. | ||
| Jim Walters Frequent User Username: jim_walters Post Number: 354 Registered: 01-2014 |
Hi Glen, it's me from Bristol Motors in Canada that you are thinking of, powdercoating the housings and using new stainless pistons in the rebuild. There is also Kelly at British Tool Works in the USA that does them, no connection to me. I could certainly send you a set but it would not be cost effective with the high shipping costs to Australia. You would have to send me back the cores from your car after installing the rebuilt ones too so that would add greatly to the cost. I have shipped parts to Australia in the past but the cost is very high. I'm sure you could find someone local to overhaul yours. Have a mechanic or yourself remove and dismantle them then glass bead blast them, and send them to you local powdercoater with instructions of where they are to be masked off so the piston bores and fluid holes are not coated. If you can't source stainless pistons or seal kits locally I can supply them as they will be an awful lot lighter to ship rather than what six heavy calipers will cost. SRH8505 SRC18015 SRE22493 NAC-05370 www.bristolmotors.com | ||
| Jeff Young Frequent User Username: jeyjey Post Number: 459 Registered: 10-2010 |
I've always used one of the 3-stones-on-springs things instead of a flapper brush. They're not very expensive: https://ige.ie/brake-cylinder-hone. (Nor are flapper brushes, but you have to make sure you get the right grit there.) | ||
| Glen Poolen Frequent User Username: wgipps Post Number: 274 Registered: 03-2018 |
Thanks Jim I sent you an email yesterday on this issue to your Bristol motors address. Can we have a chat their please? Thanks to you too David - but i dont have access to tools or space. If i take the calipers off and send them to be powdercoated locally, the car is essentially disabled and will need to be stored for the time it took to remove them, powdercoat, rebuild and reattach. So id need to find a shop that are happy to have the car sitting around. | ||
| Robert J. Sprauer Frequent User Username: wraithman Post Number: 717 Registered: 11-2017 |
Cap off the hydraulic hoses when removed. Powdercoaters have hi-temp tape to mask off things. Have torque wrench and thread lock? | ||
| David Gore Moderator Username: david_gore Post Number: 4037 Registered: 04-2003 |
Jeff, I found the abrasive hones problematic as it was easy to form a ridge at the base of the bore if used too aggressively as the stones did not extend beyond the holder. the "flappers" can be pushed right down to the end of the bore however you still have to be careful to move them uniformly up and down the bore to avoid forming a tapered bore with the consequent problems of fluid weeps. | ||
| Jeff Young Frequent User Username: jeyjey Post Number: 460 Registered: 10-2010 |
Interesting. The stones on mine do extend past the holder, but with a sample size of one I don't know how common/uncommon that is. | ||
| Jim Walters Frequent User Username: jim_walters Post Number: 355 Registered: 01-2014 |
You shouldn't hone the caliper bore, and it is unnecessary anyway. The seal does not ride on the bore surface so it does not need to be honed to take out any marks. The piston rides on the seal in the bore, so the piston surface must be smooth. The piston should only be cleaned and polished with 1000 grit wet or dry sandpaper. Anything coarser and you run the risk of damaging the seal with a rough surface left by coarse paper. Any rust pits on a piston means it must be discarded, as the pit sharp edges will carve away at the seal and cause a leak. Caliper pistons and seals function the opposite of a master or slave cylinder where the seal is on the piston and rides in the bore. SRH8505 SRC18015 SRE22493 NAC-05370 www.bristolmotors.com |
