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Brake Calipers[240-260/83] posted by Mark Erickson on
Monday, 27 April 1998, at 9:34 a.m.
When I started to replace the pads on my 83 240 I found out what the
really bad scraping noise was.. the outer pad on the right front Caliper
was down past the metal....and When I tried to put in new pads
my fears were confirmed,,, a Frozen piston on the caliper.
Well I have found a new rebuilt caliper for a reasonable price
the big question is do I need to replace the caliper bolts
when I change the caliper???? If I remember right the Bently
Manual said to replace them as they are only supposed to be
used once, The Dealership said I don't need them. Which would be right??
I'm not getting a Volvo Caliper for my work car because I figure I can
replace the caliper 2 and 1/2 times before I would equal one caliper from
Volvo and I really don't figure this car has more than 30-40,000 miles
left in the Body due to MN winters
Thanks in Advance for any help you can give me.
Mark Erickson,
83 240 DL 175,000
Re: Brake Calipers[240-260/83] posted by JohnB on
Thursday, 30 April 1998, at 2:22 p.m.
Actually I'm surprised you bought a rebuilt caliper...most of the time the existing caliper can be used...especially if you're not too particular and change your brake fluid annually.
I force out old, even frozen pistons using compressed air and a piece of wood (to hold in the other piston and provide a spot for the moving piston to hit) and at worst case a grease gun....if you go the grease gun way you get a helluva lot more pressure but have to clean out the caliper/piston thoroughly.
You can then hone the cylinder bore smooth, very lightly smooth the piston with 600 wet/r/dry Tri-M-ite paper (careful, the pistons are plated and will corrode quickly if you go through the plating and reinstall) and put in new seals and dust boots. Put the thing back together and check for immediate leaks and then brake fluid consumption/slow leaks.
I also reuse the caliper mounting bolts...if the bolts won't take the installation torque then they're stretching and should be replaced...they'll probably break if you're not paying attention while you torque them if they're stretching. Loctite blue is sufficient...you do want to get them out next time...don't use studloc.