Vintage Grumble Posted August 11, 2008 Share Posted August 11, 2008 Hello, got me a Volvo 740 Turbo, and the brake's are being cunts, when warm the front brake's are staying on, not totaly sure what the problem is, anyone else had similar problems with volvo brake's? Cheers. Quote Link to comment Share on other sites More sharing options...
fuel Posted August 11, 2008 Share Posted August 11, 2008 hah so you got that one from Trademe? I had my eye on that one but completely forgot about the auction. I would say the calipers have pistons which are sticking. Hopefully it's nothing serious like the ABS pump or something along those lines. Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted August 11, 2008 Author Share Posted August 11, 2008 Yeh, I got old blue off tard me last week. I suspected the calipers, but when I fitted new pads (the old ones were shot, and I was hoping new pads might fix it, hehe) the pistons pushed back easy, and the brake's work sweet as for a little while, then clamp on, and I cant see how the calipers them selfs would stay on? Im thinking fluid may be getting past piston in the master cylinder, and then slowly leaking back due to the return spring? Well I hope thats what it is, cos I farked the master trying to get it apart (20 years of being rite next to a turbo aint been kind to the master cylinder) and have a new one on the way. I dont know jack about ABS units, so I hope it aint that, if i pull the ABS fuse it should stop it from doing anything I guess? Quote Link to comment Share on other sites More sharing options...
mikuni Posted August 11, 2008 Share Posted August 11, 2008 The actual calipers could be fucked/seazing? I guess if the seals fuck out then shit will get in and the will start biting. Normally a problem with the master wouldn't cause the brakes to stick on. Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 11, 2008 Share Posted August 11, 2008 If it is only happening hot then you should check the sliders (assumes it has sliding calipers) Quote Link to comment Share on other sites More sharing options...
fuel Posted August 11, 2008 Share Posted August 11, 2008 I think those ones may be opposing four pots? but I'm not up to scratch with Volvos. Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 11, 2008 Share Posted August 11, 2008 ^ You are probably right. I know two Volvo techs so I might remember to ask them. Quote Link to comment Share on other sites More sharing options...
durty Posted August 11, 2008 Share Posted August 11, 2008 and i have no idea except they are way different to 240 4 pots Quote Link to comment Share on other sites More sharing options...
V8Pete Posted August 11, 2008 Share Posted August 11, 2008 Someone once told me rubber fluid lines can deteriorate, allowing fluid under pressure such as when you stomp on the pedal past, but restrict it going back the other way ftl etc. Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted August 11, 2008 Author Share Posted August 11, 2008 Yeh, im going to whip off the calipers seeing as the master cylinder is already off, and have a nose (it has twin pot calipers on it, but both pots are on one side which is a bit odd?) I did notice that the top slide had a fair bit of play in it, but once again, cant see how the heat would cause them to jam? although heat may have nothing to do with it, it may be how many times you use them? Well new master cylinder will be on tonight, it better be the problem or I farked a good master cylinder! Quote Link to comment Share on other sites More sharing options...
fuel Posted August 11, 2008 Share Posted August 11, 2008 Most modern twin pot calipers are the sliding type, so both pistons on one side This is the only image of a Volvo twin pot caliper I could find on the interwebs, I'm guessing yours is the same/similar? *EDIT* actually on second looks it seems to be a single piston caliper above, the two cutouts of either side of the main cutout put me off. Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted August 12, 2008 Author Share Posted August 12, 2008 Haha, ok, maybe its not so odd, ive seen heaps of single pot, and opposing twins, but not many one sided twin pots myself. And I believe this volvo come's with two diff brands of caliper, mine has Bendix branded ones on it, cant remember what the other brand was tho? Quote Link to comment Share on other sites More sharing options...
fuel Posted August 12, 2008 Share Posted August 12, 2008 Girling, PBR, Bosch, Sumitomo (not likely). Heaps of companies make calipers for most makes. Quote Link to comment Share on other sites More sharing options...
durty Posted August 12, 2008 Share Posted August 12, 2008 i would say they would be girling or ATE for the other type Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted August 13, 2008 Author Share Posted August 13, 2008 Girling was the other brand! brakes seem to be fixed and working well, not totally sure what the problem was, but calipers had a lot of shit in them, gave them a clean out, a light hone and a rebuild kit and they seem to be all good. Had a look at old master cylinder and it was a bit of a mess, so couldn't have hurt to change that also. Bit of a bugger to bleed tho, but from what I have read, most volvo's are. Quote Link to comment Share on other sites More sharing options...
durty Posted August 13, 2008 Share Posted August 13, 2008 Girling was the other brand! brakes seem to be fixed and working well, not totally sure what the problem was, but calipers had a lot of shit in them, gave them a clean out, a light hone and a rebuild kit and they seem to be all good. Had a look at old master cylinder and it was a bit of a mess, so couldn't have hurt to change that also. Bit of a bugger to bleed tho, but from what I have read, most volvo's are. very much so Quote Link to comment Share on other sites More sharing options...
Unclejake Posted August 13, 2008 Share Posted August 13, 2008 I talked to the Volvo expect today and he has naver heard oif this problem - but he did say if you are not used to 740 brakes then they could trick you into thinking they are sticking on as they are so savage Quote Link to comment Share on other sites More sharing options...
Vintage Grumble Posted August 13, 2008 Author Share Posted August 13, 2008 Haha, trust me, they sure as hell were stuck on, so bad that it was spining the rear wheels! but they worked perfectly when cold or first use of the day sort of thing. They are working sweet as now, ABS even works! They just feel a little soft, i'll bleed them again soon, never had a car with a bleed on the master cylinder tho. Quote Link to comment Share on other sites More sharing options...
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