help with brakes again!

[mahony]

just tried to extract pistons from calipers with no success (sprint calipers),soaked in wd40 for the last 3 days,there is some movement but unable to get leverage and do not want to damage pistons,can the calipers be split in to two halves to make removal easier as there are 4 bolts which appear to be holding the calipers together.

<p></p><i>Edited by: <A HREF=http://p206.ezboard.com/bthetriumphdolo ... >mahony</A> at: 11/6/05 11:10 am<br></i>

[Jon Tilson]

is with the master cylinder..<br>
Reconnect to your brakes, clamp the other piston and pump away. Its not a good idea to split the calliper.<br>
Never failed for me...<br>
Jonners

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[mahony]

thanks for the tip,will try this then.

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[Silvery]

... With a spare master, connected a short pipe from it to the caliper I'd removed, and found a round drift of the right diameter to pump it by hand. Took a bit of force, but was easier to keep track of what was happening than trying to do it with everything bolted to the car <!--EZCODE EMOTICON START :) --><img src=http://www.ezboard.com/intl/aenglish/im ... /smile.gif ALT=":)"><!--EZCODE EMOTICON END-->

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[DailySprinter]

I've always done it with an air line.<br>
If you have a friend with a garage or compressor get them to blow compressed air into caliper.<br>
<br>
Its always worked and saves the hassle of connecting them back on the car, just be careful they do tend to blow out with some bang.

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[alun n]

Lots of moisture in compressed air; make sure its expelled from all brake components before reconnecting if you use the air route

<p>1973 Dolomite Sprint<br>
1974 Dolomite Sprint<br>
1977 Dolomite Sprint<br>
1979 Dolomite Sprint<br>
1980 Dolomite 1500HL<br>
1998 Lotus Elise<br>
1999 Alfa Romeo 166</p><i></i>

[Paul]

compressed air does store alot of energy, its best to use a master cylinder or grease gun, if using a grease gun make sure all the grease is removed as it will perish the seals. i assume your changing the seals? you willl need to now they have been soaked in WD-40.<br>
<br>
Pauk

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[mahony]

THANKS FOR ALL THE TIPS GUYS,HAVE NOT MANAGED TO GET ROUND TO DOING IT YET AS SOMETHING ELSE CAME UP (ALWAYS THE WAY!) FOR THE RECORD I AM REPLACING THE SEALS AND MAYBE THE PISTONS IF THERE SHOT.<br>
<br>
GLEN

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[DailySprinter]

Its very unlikely you'll need to replace the pistons. I have an old Rover P5, and blew out the pistons, they did not look good at all but would have been so extremely expensive to replace but they were cleaned up with fine wet & dry and resealed. That was 2 years ago and never a leak. Calipers very rarely leak as the pistons are so much larger than in wheel cylinders, I guess the pressure must be less on them.

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[alun n]

Meths wiped hard with a rag cleans up caliper cylinders a treat, even takes the rust off without needing abrasion!<br>
<br>
Pressure in a system is equal; they leak less because its a squarer section seal as opposed to a flanged seal on which the flange wears down

<p>1973 Dolomite Sprint<br>
1974 Dolomite Sprint<br>
1977 Dolomite Sprint<br>
1979 Dolomite Sprint<br>
1980 Dolomite 1500HL<br>
1998 Lotus Elise<br>
1999 Alfa Romeo 166</p><i></i>