---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Sun 04/29/18: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:26 AM - Re: Mono brake binding (Roger Sheridan) 2. 02:31 AM - Re: Mono brake binding (Alan Burrill) 3. 03:39 AM - Re: Mono brake binding (Ivor) 4. 10:45 AM - Re: Re: Mono brake binding (david park) 5. 02:28 PM - Re: Re: Mono brake binding (Bud Yerly) ________________________________ Message 1 _____________________________________ Time: 12:26:41 AM PST US From: Roger Sheridan Subject: Re: Europa-List: Mono brake binding I had a similar problem caused by the brake disk fouling the cali per & causing the piston to jam. The disc face had been machined & ran true but it had not been radiused. Managed to file away the offending material without having to remove the wheel. Regards, Roger > On 28 Apr 2018, at 22:56, martinburns wrote: > > > The brake slave piston on our Mono does not retract when the brake lever is released. This results in the brake constantly dragging. > After pushing the piston back with a G clamp it is fine for a short while and then jams again. I have dismantled the cylinder, fitted a new O ring and cleaned up the piston and cylinder, but the condition eventually recurs. > Does anyone have an explanation and a solution? > > -------- > Martin Burns > G-OJHL > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=479662#479662 > > > > > > > > > ________________________________ Message 2 _____________________________________ Time: 02:31:54 AM PST US From: Alan Burrill Subject: Re: Europa-List: Mono brake binding Martin, there may not be one solution. Here are a number of suggestions from my experience in motor trade as well as my own Europa. Cleanliness of the parts is the first issue. Not only the slave cylinder but the slider of the floating calliper. Make sure mechanically the calliper is lubricated, I use copper grease, and the calliper is free to slide. Too much grease and it will contaminate the pads so be careful. I had a similar issue with my trig-gear and found two problems. Overfilling of the master cylinder to the top of the filler hole so that on screwing in the filler plug it exerted a small amount of pressure on the fluid, there is no reservoir like car systems to relieve excess pressure. After filling and putting the cover plate back on the brake leavers were forced back by a few millimetre again putting pressure in the cylinders. It may be worn disks and the resulting ridges is the source of the binding. Good luck. Alan G-OBJT Sent from my iPad > On 28 Apr 2018, at 22:56, martinburns wrote: > > > The brake slave piston on our Mono does not retract when the brake lever is released. This results in the brake constantly dragging. > After pushing the piston back with a G clamp it is fine for a short while and then jams again. I have dismantled the cylinder, fitted a new O ring and cleaned up the piston and cylinder, but the condition eventually recurs. > Does anyone have an explanation and a solution? > > -------- > Martin Burns > G-OJHL > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=479662#479662 > > > > > > > > > ________________________________ Message 3 _____________________________________ Time: 03:39:43 AM PST US Subject: Europa-List: Re: Mono brake binding From: "Ivor" Martin have you got a matco hand brake valve in the circuit? if so they can cause exactly that problem, they need to be adjusted so the arm is exactly 90 degrees to the body to be fully off, Read this topic online here: http://forums.matronics.com/viewtopic.php?p=479683#479683 ________________________________ Message 4 _____________________________________ Time: 10:45:10 AM PST US Subject: Re: Europa-List: Re: Mono brake binding From: david park I had a problem with my Matco handbrake valve in Burgos 2 years ago and had to stop while taxiing for fuel and release pressure on the bleed valves. Put it down to overheating? Dave Park G-LDVO > On 29 Apr 2018, at 11:39, Ivor wrote: > > > Martin > have you got a matco hand brake valve in the circuit? if so they can cause exactly that problem, > they need to be adjusted so the arm is exactly 90 degrees to the body to > be fully off, > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=479683#479683 > > > > > > > > > ________________________________ Message 5 _____________________________________ Time: 02:28:05 PM PST US From: Bud Yerly Subject: RE: Europa-List: Re: Mono brake binding The Kart brakes are a bit annoying. The installation in the mono is on an angle so a constant bubble is in the master unless you unscrew the forward piston holder screw, loosen the aft one, tilt the brake master to level wit h the earth and fill the piston area. In my articles on line I have discussed the KartKraft brake masters and won =92t bore you. It is true, that if you fill the master perfectly and there are no slave cylinder (AKA caliper) problems or trapped air, if the brakes get hot, the pads and then the piston can get hot enough to pressurize a D OT 3 or 4 brake fluid and can cause the brake to drag building more heat. This happens in go kart racing all the time after the winter lull. That is why there are racing brake fluids. Since DOT 3 and 4 are hydroscopic to t he extreme, being ethylene glycol based, internal corrosion and boiling can be a problem. Maintenance of any brake system should involve disassembly and inspection of the calipers, but let=92s face it, that is a pain in the butt, knees and back, and causes more leaks and headaches than we operator s are willing to do. On an annual, one should pull the pads and inspect, t hen remove the brake caliper, lube the slides, clean the exterior and the a rea between the piston and bore, change any Dot 3 or 4 fluid, and assure th e master is replenished at a minimum. Popping the puck out of the caliper and cleaning the bore is not on my to do list. Just clean it and when the caliper gets pitted and fails to move, then change it. You better check th at Europa has caliper stock on hand. Note: I prefer to use silicone fluid as it doesn=92t stain or absorb water , and handles heat better. Overheating of the brakes in a trigear is more of a problem than many reali ze. A long taxi in a stiff crosswind will generate enough disk heat that the pl astic lines near the disk will actually soften and swell. If it doesn=92t fail, the plastic line swells up like an aneurism. Even with the pants off , these lines can be overheated by excessive disk heat. I have since insta lled a brake heat shield to protect those plastic line sections near the wh eel disk. The wheel pants can restrict cooling air and cause temperatures inside the wheel pant to hit alarmingly high values. If you have long taxi times one should ensure a small NACA duct is built into the pant to allow cooling air flow and or add some similar heat shielding device to protect y our plastic brake lines. On one aircraft we installed approved automotive lines from a prominent racing supplier of braded high temperature hoses to also help, and on others installed heat sleeve (that silver sleeve by Therm oTec) to reflect the heat from the lines. The Matco parking brake valve is another issue. It can fail. After all, i t is just a plunger and spring affair with a cam. If the spring fails or p lunger jams because of using improper fluids, the park brake will not relea se or may drag. Matco park brake valves cannot be used with DOT 3 or 4. O nly Mil 5606 and DOT 5 silicone fluids can be used unless you do a seal cha nge. Of course, as stated, the orientation of the handle on the valve is c ritical. Failure to install the handle mechanism properly can lead to a pa rk brake that will not release. Another failure is in Matco=92s new design where the left and right chambers are completely separate, as the valve bo dies can be installed non parallel. The new valve is called the PVPV-D. I n this design, it is easier to install the fittings, but will cause problem s if both cylinders are not installed absolutely even, obviously. Finally, in high corrosion environments, (salt air environment, grass and s andy fields or from lack of use) the Matco slave or caliper piston may jam . This is highly unlikely, but if the piston, bore, or seal is worn, or if the pads are horribly worn, or the caliper slides well worn, one can exper ience a puck or piston that may get cocked in the bore. This is best fixed by getting a new brake caliper but if you have hours of time and patience, the caliper can be removed, buffed and polished out and with new seals ins talled it should work well. If you re-bore your caliper, keep in mind the c hance of jamming goes up as there is more clearance. If the caliper slide s are damaged, well, that is a call to Europa as the factory never used the nice replaceable brake plate assembly Matco supplies with the calipers. T he caliper plate assembly is built into the MG02 (Trigear) or LG21 (in the mono). If the caliper slide holes get worn, the brakes rattle terribly and can actually jam. They can be sleeved, but I=92m just getting a new MG02/ LG21. Best Regards, Bud Yerly Sent from Mail for Window s 10 ________________________________ From: owner-europa-list-server@matronics.com on behalf of david park Sent: Sunday, April 29, 2018 1:43:45 PM Subject: Re: Europa-List: Re: Mono brake binding I had a problem with my Matco handbrake valve in Burgos 2 years ago and ha d to stop while taxiing for fuel and release pressure on the bleed valves. Put it down to overheating? Dave Park G-LDVO > On 29 Apr 2018, at 11:39, Ivor wrote: > > > Martin > have you got a matco hand brake valve in the circuit? if so they can cau se exactly that problem, > they need to be adjusted so the arm is exactly 90 degrees to the body to > be fully off, > > > Read this topic online here: > > https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fforums .matronics.com%2Fviewtopic.php%3Fp%3D479683%23479683&data=02%7C01%7C%7C70 930b0cb2e94efc01ce08d5adf9a803%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7 C636606210128025011&sdata=K7PxuSUTS56dwdAb1BwDoQIfm6s%2FXdV3ScSN6C7hCKI%3 D&reserved=0 > > F%2Fwww.matronics.com%2FNavigator%3FEuropa-List&data=02%7C01%7C%7C70930b0 cb2e94efc01ce08d5adf9a803%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C6366 06210128025011&sdata=rv%2Fn%2BaeVvPx%2FNwgTqJE0Hrp3hawaZE0tUgPVOsFOY0Y%3D &reserved=0 F%2Fforums.matronics.com&data=02%7C01%7C%7C70930b0cb2e94efc01ce08d5adf9a8 03%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636606210128025011&sdata= OwjAFrvJrvxuAGJCzYCkmbWtfI0%2BhSOiYqPEpmFC1UY%3D&reserved=0 F%2Fwiki.matronics.com&data=02%7C01%7C%7C70930b0cb2e94efc01ce08d5adf9a803 %7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636606210128025011&sdata=8% 2ByiHdwfSEPomzmyfESWRYsI9YLZk5FHOOYJ9I6gJ%2Bo%3D&reserved=0 F%2Fwww.matronics.com%2Fcontribution&data=02%7C01%7C%7C70930b0cb2e94efc01 ce08d5adf9a803%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636606210128025 011&sdata=O4ChzE1dqh0S2aTugLSr2efO%2BxfXfa7iXBTn5xN9%2Bmo%3D&reserved=0 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.