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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars

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740 Front brake pads

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Old Feb 17th, 2019, 13:46   #11
Laird Scooby
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Quote:
Originally Posted by jpliddy View Post
hi all
one of my dust seals on the front wheel is slowly coming out of the caliper over the years . all original parts i clean all the bits i can yearly remove guide pins and clean and regrease but ive never had the callipers of the car ive done discs on front twice now in 19 years but the clapper dust seals look a bit daunting as it woud mean new hoses too . i have been thinking of getting new/reconditioned callipers from some where like BIG RED or BRAKE PARTS UK
all comments welcome
Couple of points Jim, the hoses unbolt from the caliper so no definite need for new hoses if you change the calipers and if it is only the dust seal round trhe piston, these can be replaced without even removing the caliper completely. Just lift the caliper up as if changing the pads, remove the old dust seal and clean the area then fit a new dust seal.

If you do go for new/reconditioned calipers, i've heard good reports on Big Red, heard mixed reports on Brake Parts UK and a similar company (possibly linked) called ABS - All Brake Spares i think it is.

If you're contemplating new/refurb calipers, give Bigg Red a look :

http://www.biggred.co.uk/

Should take you to their home page and then enter your reg number, hopefully they have it right!
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Old Feb 17th, 2019, 18:23   #12
Ian21401
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Default Front calliper piston dust seal.

My 940 has single piston sliding front callipers. During general service after purchase I found that the piston dust seal on the front offside was split. It was not practical to deal with it at that time so I sprayed silicone spray through the slit as a first aid stop gap measure. On previous cars I’ve had the dust seals located in a lip on the caliper and a groove on the piston so it was easily possible to replace the seal without disturbing the piston so no bleeding required and caliper overhaul kits were easily obtained. On the 940 the dust seal locates within the bore of the caliper so it is necessary to pop the piston. I didn’t relish this job. The dealer could not supply any kit or dust seals but I eventually obtained some Scan Tech ones via Braden Motor Co. (part no. 18.4134). Popping the piston was the easy part. I found that the old seal was well stuck in the groove on the inside bore of the caliper. Having eventually removed it it was necessary to clean the crud from that groove. This was accomplished by using a small rotary brush on a rotary Dremel type drill and the end of a piece of bent coat hanger wire. Fitting the new seal was extremely fiddly but eventually it was in. Feeding the piston back through the seal and into the caliper bore was equally fiddly but patience prevailed. After bleeding everything was ok and it'’s still ok. This had no effect on the hoses, so if they are ok then they shouldn’t need replacing.
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