Peter Douglas Winn Posted September 26, 2021 Report Share Posted September 26, 2021 I am in the process of replacing the seals in my Front brake calipers. it is always a messy job I use the brake pressure to move the pistons. Fluid everywhere, G-clamps that never seem to be the right size and the bits of wood used last time, have been thrown away and I have no reserve. Why all of this? I do not have an air supply Quote" Extract the caliper pistons. Piston removal may be affected usingĀ a low pressure air line." A foot pump no good I cannot get a good enough seal, Handpump the same. My little electrical pressure pump has the same problem no pressure due to a bad connection. Any body with a great idea and a clean one? I am fed up with cleaning up all the mess. Quote Link to post Share on other sites
Andy Moltu Posted September 26, 2021 Report Share Posted September 26, 2021 I have used a high pressure air line. Wrap the caliper in rags so no damage can be done when the pistons come out. Once one is out push it jus back in, tether with cloth and blow the other out. A foot pump will not provide enough air most of the time. Quote Link to post Share on other sites
Peter Douglas Winn Posted September 26, 2021 Author Report Share Posted September 26, 2021 Andy you have miss the point. I have no air and no chance of getting air into my underground garage. Quote Link to post Share on other sites
RogerH Posted September 26, 2021 Report Share Posted September 26, 2021 Hi Peter, Ā do you have a MIG welder. It may be possible to weld a bat onto the piston and use this to pull it out. Ā Roger Quote Link to post Share on other sites
ntc Posted September 26, 2021 Report Share Posted September 26, 2021 4 hours ago, Peter Douglas Winn said: I am in the process of replacing the seals in my Front brake calipers. it is always a messy job I use the brake pressure to move the pistons. Fluid everywhere, G-clamps that never seem to be the right size and the bits of wood used last time, have been thrown away and I have no reserve. Why all of this? I do not have an air supply Quote" Extract the caliper pistons. Piston removal may be affected usingĀ a low pressure air line." A foot pump no good I cannot get a good enough seal, Handpump the same. My little electrical pressure pump has the same problem no pressure due to a bad connection. Any body with a great idea and a clean one? I am fed up with cleaning up all the mess. Why ? New ones are cheap and do the jobĀ Quote Link to post Share on other sites
Peter Douglas Winn Posted September 26, 2021 Author Report Share Posted September 26, 2021 The reason is the Brake cylinders are new but who knows if the rubbers are not old. As a precautionary measure I have decided to change the seals. I have done the job many times so that is not the problem. I am just fed up with the mess eachtime.Ā Roger If you can find a civil servent that is prepared to permit MIG welders in an underground parking space please tell me. Quote Link to post Share on other sites
Mike C Posted September 26, 2021 Report Share Posted September 26, 2021 5 hours ago, ntc said: Why ? New ones are cheap and do the jobĀ +1. Buy a cheap air modern compressor. The days are well past when only wealthy restorers could afford these. Quote Link to post Share on other sites
Peter Douglas Winn Posted September 27, 2021 Author Report Share Posted September 27, 2021 Do they run on a car battery? I have no power point in the garage. (The community do not want to pay for the electricity and they refuse to permit a meter). The little one I use to pump up the tyres takes ages (battery device) I cannot get a decent seal and the pressure is never enough. I have an underground garage it is forbidden to work on cars, but they turn a blind eye to nuts and bolt jobs. This means I can do a lot of jobs. Quote Link to post Share on other sites
Z320 Posted September 27, 2021 Report Share Posted September 27, 2021 Hi Peter, buy a cheapĀ one with wheels, load the pressured air container up to 8Ā bar. After loaded unplug it and take the unit (on wheels)Ā to your car, this will do the job. If not move it back to the next 230V supply. Du machst das, GrĆ¼Će, Marco Quote Link to post Share on other sites
Peter Douglas Winn Posted September 27, 2021 Author Report Share Posted September 27, 2021 It could work but is there not a mechanical way of doing the job? Quote Link to post Share on other sites
Mike C Posted September 27, 2021 Report Share Posted September 27, 2021 56 minutes ago, Peter Douglas Winn said: Do they run on a car battery? I have no power point in the garage. (The community do not want to pay for the electricity and they refuse to permit a meter). The little one I use to pump up the tyres takes ages (battery device) I cannot get a decent seal and the pressure is never enough. I have an underground garage it is forbidden to work on cars, but they turn a blind eye to nuts and bolt jobs. This means I can do a lot of jobs. Can you use something like this: https://www.google.com/aclk?sa=l&ai=DChcSEwjkqqH3wJ7zAhV0kWYCHbeYADYYABALGgJzbQ&sig=AOD64_3yOSEoZd370_tqn7iHc1T2mQntPg&adurl&ctype=5&ved=2ahUKEwjxy5b3wJ7zAhUHuksFHaQZCJwQvhd6BAgBEFI FillĀ it up at a garage. Quote Link to post Share on other sites
Z320 Posted September 27, 2021 Report Share Posted September 27, 2021 What about to bring the calipers to a friend and his air compressor? Quote Link to post Share on other sites
Drewmotty Posted September 27, 2021 Report Share Posted September 27, 2021 Replace the bleed nipple with a grease nipple and use a grease gun.Ā Quote Link to post Share on other sites
JochemsTR Posted September 27, 2021 Report Share Posted September 27, 2021 (edited) 1 minute ago, Drewmotty said: Replace the bleed nipple with a grease nipple and use a grease gun.Ā Finally! +1 Actually, I was able to pull the pistons out by hand....they really should not be locked up. But the grease works very well too. Ā Edited September 27, 2021 by JochemsTR Quote Link to post Share on other sites
Z320 Posted September 27, 2021 Report Share Posted September 27, 2021 A mechanical tool could be something like a O-ring or a rubber washer, compressend between two washers (made of aluminium) by a bolt / ring nut. To pull the piston out by the ring nut.Ā You know: like on thermos flasks?. BUT: this could fail anyway and you have so many other options... Ā Quote Link to post Share on other sites
Peter Douglas Winn Posted September 27, 2021 Author Report Share Posted September 27, 2021 I like that idea. What about contamination. I don't think I have a completly clean grease gun. Ok, I could on a Sunday take the calipers to a place with compressed air. I am trying to do the job in the underground garage without any agro. Quote Link to post Share on other sites
Andy Moltu Posted September 27, 2021 Report Share Posted September 27, 2021 As you have the calipers off the car why restrict yourself to the tools in an underground garage? Use an air bed adaptor with the extreme tip cut off to use a foot pump but ideally take ot to a workshop, friend or neighbour with a high pressure air line and save yourself a lot of time and aggro. Quote Link to post Share on other sites
Peter Douglas Winn Posted September 27, 2021 Author Report Share Posted September 27, 2021 Andy I can bleed the fluid with my vacuum pump. Then I have to have compressed air. Where I live this is not easily avaiable. The only compressed air in the vicinity is the local petrol station, tyre pumps. I am hoping I can just pull the pistons out. If not I have this problem. I am looking for an easy way, without having to take off all the bits and get into a car and drive around until I find somebody with the right gear. Re. friends nobody repairs their cars nowdays, infact they don't even wash them themselves, they just spend money and go to the wash garage. To be fair, it is forbidden to wash cars on the streets and all the old washing places have to have a very expensive oil seperators. So much for the greens. Most of the young garage employees here are trying to find the USB connection in the TR6 for their analytic computer. Or as a very highly qualified engineer said that's interesting when shown a torque wrench.Ā I won't mention the firm involved. Quote Link to post Share on other sites
Peter Douglas Winn Posted September 27, 2021 Author Report Share Posted September 27, 2021 Mike for that price I take the car to a local garage. I haveĀ no storage space in the garage so afterwards I would throw it away. Hum. Quote Link to post Share on other sites
barkerwilliams Posted September 28, 2021 Report Share Posted September 28, 2021 Remove connector hose from your foot pump and clip onto spare tyre, a few cubic feet of pressurised air available Alan Quote Link to post Share on other sites
Peter Douglas Winn Posted September 28, 2021 Author Report Share Posted September 28, 2021 Great I have never had a spare tyre. I need it for the tools as my wife has taken command of the boot. Quote Link to post Share on other sites
dingle Posted September 28, 2021 Report Share Posted September 28, 2021 Peter-You have my sympathy. I can't imagine a more depressing situation than having a TR6 and not being allowed the freedom of working on it. Perhaps this is what hell will be like.Ā There must be someone in your circle of acquaintances with an air compressor that would blow the pistons out. Berry Quote Link to post Share on other sites
paul83 Posted September 28, 2021 Report Share Posted September 28, 2021 Hi Peter, If you are able/Ā willing to remove the callipers from the car, then this can be done by mechanically leavening out the pistons: Ensure either the bleed nipple or break pipe entry is open (to allow flow of fluid / stop suction due to non-flow of break fluid). Remove the dust cover from the piston. Spray WD40 between the side of the piston and the housingĀ (if the piston has rusted and has not been used for a while, it might be stuck). Gently push the piston back into the calliper - just a little bit, to free the piston. Using two flat screwdrivers on opposing sides,Ā lever the piston out. Use the protrusionĀ on each side of the calliper as the fulcrum point for the screwdriver, and insert the screwdriver into the recess in the piston used to retain the dust cover. Using just one screwdriver does not work because the piston tilts within the housing and locks. See the attached photo. I have used this technique on rusted pistons and managed to extract them without damaging them. Ā @anyone: does anyone know if stainless steel pistons are a good thing? Stainless steel expands about 34% more than carbon steel (of the standard pistons), so I was wondering how they behave once the disc has become hot due to breaking. Paul Ā Quote Link to post Share on other sites
wheeler Posted September 28, 2021 Report Share Posted September 28, 2021 Peter Have a look at this Hyfive Tyre Compressor Pump 12V DC Car and Bike Inflator 250 PSIĀ https://www.amazon.co.uk/dp/B00V89HQNQ/ref=cm_sw_r_apan_glt_fabc_0AV6GS5M66AM0K22BJSW?_encoding=UTF8&psc=1 Quote Link to post Share on other sites
Peter Douglas Winn Posted September 29, 2021 Author Report Share Posted September 29, 2021 Bill this is exactly the one I use but it is very low pressure which only builds up if there is a perefct seal. Paul I am sure I can get the caliper off. I will try it, I thought about doing this. The reason I did not go this way in the past was the worry about damaging the Pistons. I can empty the system as I have a vacuum pump. Quote Link to post Share on other sites
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