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martinburns
Joined: 07 Dec 2013
Posts: 5
Location: Scotland
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 Posted: Sat Apr 28, 2018 1:56 pm Post subject: Mono brake binding |
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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?
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Martin Burns
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rogersheridan(at)mac.com
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| Posted: Sat Apr 28, 2018 11:26 pm Post subject: Mono brake binding |
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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
| Quote: | On 28 Apr 2018, at 22:56, martinburns <martin_burns(at)ntlworld.com> 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
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Burrilla
Joined: 25 Apr 2015
Posts: 182
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| Posted: Sun Apr 29, 2018 1:31 am Post subject: Mono brake binding |
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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
| Quote: | On 28 Apr 2018, at 22:56, martinburns <martin_burns(at)ntlworld.com> 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
|
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Ivor
Joined: 23 Jul 2015
Posts: 51
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| Posted: Sun Apr 29, 2018 2:39 am Post subject: Re: Mono brake binding |
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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,
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martinburns
Joined: 07 Dec 2013
Posts: 5
Location: Scotland
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| Posted: Sun Apr 29, 2018 9:19 am Post subject: Re: Mono brake binding |
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Thanks for your suggestions.
Roger: I don't understand how the brake disk could cause the piston to jam. Can you explain?
Ivor: We do have a parking brake valve in the circuit. I had not thought of that as a possible cause. When I am next at the airfield I will check to see if it turns off fully.
I would be grateful for any further contributions.
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Martin Burns
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dpark748(at)me.com
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| Posted: Sun Apr 29, 2018 9:45 am Post subject: Mono brake binding |
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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
| Quote: | On 29 Apr 2018, at 11:39, Ivor <g-iver(at)live.co.uk> 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
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budyerly(at)msn.com
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| Posted: Sun Apr 29, 2018 1:28 pm Post subject: Mono brake binding |
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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 with the earth and fill the piston area.
In my articles on line I have discussed the KartKraft brake masters and won’t 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 DOT 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 the 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’s face it, that is a pain in the butt, knees and back, and causes more leaks and headaches than we operators are willing to do. On an annual, one should pull the pads and inspect, then remove the brake caliper, lube the slides, clean the exterior and the area between the piston and bore, change any Dot 3 or 4 fluid, and assure the 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 that Europa has caliper stock on hand.
Note: I prefer to use silicone fluid as it doesn’t stain or absorb water, and handles heat better.
Overheating of the brakes in a trigear is more of a problem than many realize.
A long taxi in a stiff crosswind will generate enough disk heat that the plastic lines near the disk will actually soften and swell. If it doesn’t 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 installed a brake heat shield to protect those plastic line sections near the wheel 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 your 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 ThermoTec) to reflect the heat from the lines.
The Matco parking brake valve is another issue. It can fail. After all, it is just a plunger and spring affair with a cam. If the spring fails or plunger jams because of using improper fluids, the park brake will not release or may drag. Matco park brake valves cannot be used with DOT 3 or 4. Only Mil 5606 and DOT 5 silicone fluids can be used unless you do a seal change. Of course, as stated, the orientation of the handle on the valve is critical. Failure to install the handle mechanism properly can lead to a park brake that will not release. Another failure is in Matco’s new design where the left and right chambers are completely separate, as the valve bodies can be installed non parallel. The new valve is called the PVPV-D. In this design, it is easier to install the fittings, but will cause problems if both cylinders are not installed absolutely even, obviously.
Finally, in high corrosion environments, (salt air environment, grass and sandy 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 experience 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 installed it should work well. If you re-bore your caliper, keep in mind the chance of jamming goes up as there is more clearance. If the caliper slides 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. The 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’m just getting a new MG02/LG21.
Best Regards,
Bud Yerly
Sent from Mail for Windows 10
From: owner-europa-list-server(at)matronics.com <owner-europa-list-server(at)matronics.com> on behalf of david park <dpark748(at)me.com>
Sent: Sunday, April 29, 2018 1:43:45 PM
To: europa-list(at)matronics.com
Subject: Re: Re: Mono brake binding
--> Europa-List message posted by: david park <dpark748(at)me.com>
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 <g-iver(at)live.co.uk> wrote:
>
> --> Europa-List message posted by: "Ivor" <g-iver(at)live.co.uk>
>
> 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,
>
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>
> Read this topic online here:
>
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