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jimpuglise(at)comcast.net
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 Posted: Wed Nov 30, 2011 10:01 am Post subject: Chattering brakes |
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I used the kit-furnished Jamar brake cylinders and Matco calipers. The brakes work fine, but there is about 1/8 play if you wiggle the calipers, and they chatter like crazy while in motion. If I exert just enough pressure to move the pucks a little, the chatter disappears. It appears to me that there is too much play in the calipers, but we checked the drawings, and everything is installed properly.
Any ideas?
Jim Puglise
N283JL, now at 10.2 hours
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Ivor Phillips
Joined: 16 Jan 2006
Posts: 253
Location: London UK
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| Posted: Wed Nov 30, 2011 12:43 pm Post subject: Chattering brakes |
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Hi Jim
just a thought have you fitted the four spacers for the torque plate and brake pads
I also used some copperslip between the spacers for lubrcation, another problem i had in the early days was the allen screws hold the discs to the wheels became loose even with the locking wire, this caused some noise when taxying, solved it by using loctite and locking wire,
regards
ivor
G-IVER
On 30 November 2011 17:58, <jimpuglise(at)comcast.net (jimpuglise(at)comcast.net)> wrote:
[quote] I used the kit-furnished Jamar brake cylinders and Matco calipers. The brakes work fine, but there is about 1/8 play if you wiggle the calipers, and they chatter like crazy while in motion. If I exert just enough pressure to move the pucks a little, the chatter disappears. It appears to me that there is too much play in the calipers, but we checked the drawings, and everything is installed properly.
Any ideas?
Jim Puglise
N283JL, now at 10.2 hours
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budyerly(at)msn.com
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| Posted: Sat Dec 03, 2011 7:35 pm Post subject: Chattering brakes |
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<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> Jim,
Because we let our planes sit so long and so much dirt builds up on our wheels and brakes, obviously clean the slide pins and caliper bushes. I am sure your disk is installed correct and runs true. Roll the plane slowly and look at the disc track and caliper and check that all runs true. See the Matco website for tips in installation and caliper alignment. I have always just slid the caliper where it fit, but there is actually a procedure. See : http://static.veracart.com/matco/item_pdfs/2665/document1.pdf I have never needed to lube the caliper slide pins, just a good cleaning and alignment is all that is normally needed.
Next be sure to clean the disk well. Yours truly squirted Dot 5 silicone fluid on the disk during my bleed and sure enough, less than smooth performance and a required change of the pad due to poor braking quality. A good cleaning was all that was needed.
Lastly, the Jamar doesn't normally transmit the vibration of the caliper if the adjustment forks that attach to your handles are screwed out a bit. If they are screwed down (toward the cylinder) until the pucks move in a bit holding slight pressure then your direct hydraulic transmission of the caliper movement will be quite noticeable.
Congrats on your good looking plane and here's hoping the fly off and engine break in goes well.
Regards,
Bud
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