scathcart

[quote name='inanimate_object' date='May 27 2005, 03:52 AM']Ok if you say so! I was going on the basis that if a foot can provide enough pressure for un-servoed brakes then a foot pump would be better suited. Better safe than sorry and all that.



Mark


[/quote]



I'm not sayign a foot pump wouldn't work, in fact, I think it would work great. I was simply saying that using an air compressor will not produce enough pressure to do any damage.



I've installed a few roll control systems on cars (to help with staging/burnout), with a brake pressure gauge installed for consistency. It sure is interesting to watch the pressure climb over 1500 psi, and to watch the pressure during different braking situations.

inanimate_object

[quote name='scathcart' date='May 27 2005, 11:11 PM']I'm not sayign a foot pump wouldn't work, in fact, I think it would work great. I was simply saying that using an air compressor will not produce enough pressure to do any damage.



I've installed a few roll control systems on cars (to help with staging/burnout), with a brake pressure gauge installed for consistency. It sure is interesting to watch the pressure climb over 1500 psi, and to watch the pressure during different braking situations.


[/quote]

I think you're misunderstanding me - I agree with you 100%. If I were asked again, I guess my real reservation with air compressors is they're probably a bit overkill for the job, thre's a needless danger element - unless of course you use a regulator which is exactly what you suggested



Mark

Dysfnctnl85

Since the brakes came off a car in a junkyard, putting them back on was not an option!



I ended up getting the out with compressed air and careful attention to where air was leaking. I ended up getting them out, I'm just concerned now what I should do about the pistons, they look kinda shady.



[attachment=31184:attachment]



[attachment=31185:attachment]



Sorry for the blurry pic but you can still see the oxidation where the piston will contact the new seals...

Dysfnctnl85

Anyone?

inanimate_object

They don't look too bad to me. If there's no rust on the outside I'd use em.



Mark

Travis R

I've never been able to get stuck pistons out with compressed air. I've always left them hooked up the the car and pumped the pedal with a block of wood in place of the disk.

Dysfnctnl - clean the pistons and their bores up as best you can with *very* fine sandpaper. If either are pitted in the area that will contact the seal, then they're trash, unless you know of a way to fill the pits with something that will survive in brake fluid (then sanding back down smooth of course)... I've often wondered if jbweld would work, but I'm too scared to try.

Dysfnctnl85

Thanks for the advice guys, I'll get some very fine grit sand paper this weekend and give it a go.