Brake Maintenance
In early September, I Discovered the importance of two working brakes in a RV9A. I taxied up to the hold short line, stepped on the brakes and started doing left donuts.
The O-Ring had overheated and assumed a square section, thus dribbling red.
This is my upgrade installation, first brake job, based mostly on this forum in bits and pieces and the Cleveland publications.
I hope others find it helpful.
The Discs:
-The Cleveland upgrade kit is a Cleveland upgrade Kit 199-93 contains every thing you need (I Think) for $ 674 from ACS.
-The Van’s Original Replacement Cleveland disc is a 164-01700 $169 from ACS. The Disc is 0.182” thick new and fails at 0.167” min.
-The upgrade Rapco disc is a 164-09900 $98.50 from ACS. The Disc is 0.295” thick new and fails at 0.275” min.
-The difference between the Cleveland disc and the Rapco disc is 0.295- 0.182= 0.113 ~= to 0.125 for the shim.
The Brake Assembly
-Matco Brake liners are 0.186 thick new and 0.100 thick min.
-Use Dow Corning #55 o-ring lube for the piston o-ring.
-Use locktite C5A anti seize for the anchor bolts.
-Use Arbor Shim 0.0620 x 1.25 ID x 1.750 OD PN# 5GA99 from Grainger
-Use Bleeder valve cap PN# 183 00100 from ACS
-O-Ring MS28775-218 $0.49/ea from ACS
INFO
-Parker Hannifin Corp.
1-800-272-7537
-Cleveland Wheel and Brake Product catalog
Pub Number AWBPC0001-20/USA
Tools Used
-Brake Fluid Reservoir vent. 7/16” Wrench.
-My brake fluid drain tube with AN fittings 1/2” & 9/16” Wrenchs.
-Brake assembly Bleed Fitting 1/4” 6 Point box end combination Wrench. Use the six Point end only to tighten and break loose the Bleed fitting. It is tiny.
-VA-106 Axle Nut. 1 1/2” Socket.
Backplate Bolts 7/16” Wrench.
The Procedure
-Remove the brake Assembly and one Wheel using your preferred jacking method.
-Let the air out of the tire.
-I used for wooden stakes and four bar clamps to hold the wheel assembly together, while removing the three bolts holding the wheel and disc together. Replace the disc with the new disc.
-Lube the Axle and install arbor shims and slide the wheel back on. Vans wants 0.032 to 0.094” gap between the disc and U-810 (The inside Main Wheel Fairing support plate). Add or remove shims to achieve the gap.
-Reinstall the Axle Nut and adjust by sanding the inside end to allow the Cotter key to be reinserted.
-Make two 1/8” Al spacer to the shape of the machined surface on the Back Plate.
-Lube the o-ring, piston and cyl with the o-ring lube.
-Lube the Anchor bolts and the anchor bolt holes with the anti seize.
-Use a 3/16” dowel to insert through the top bolt hole, the shim and the back plate. This will hold that assembly in place while starting the lower bolt into the backing plate. The top bolt is then easy to install.
-Bolt torque for Backplates 75-80 inch-lbs.
Matco Master cylinders are MC-4-F Left (2 needed) and MC-4-F Right (2 needed).