MSR Brake Update Instructions

Technical and Repair Discussions
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PostPosted: Wed Nov 30, 2011 4:08 pm
1) Find out what type of brake pins you have, there are at least 4 types.

a) 0.500" original Renault chrome plated

b) 0.500" aftermarket (NAPA or similar) sometimes not with good surface finish, or not the same length or no starter taper on the thread end.

c) 0.491" plated pins from SCCA in the past 4-6 months

d) 0.485" plated pins from SCCA in the past 3 years

Any pin you use must be shiny and smooth, no burrs, nicks or rust. If the plating is dull they are probably a poor aftermarket version. We have two types of bushing available, the 0.500" and the 0.485". You can tell the difference by the narrow band machined off the end of the SCCA logo on the 0.500 version. These bushings were designed with a pin fit clearance of 0.006" which means that if you have 500 pins you must use the 500 bushing. If you have 485 pins you must use the 485 bushing. If you have the 491 pin you MIGHT be able to use either bushing at your own risk, the 500 would be sloppy and the 485 would only have 0.001" clearance causing the binding issue that you have heard so much about with slight miss-alignment.

2) Order the correct size bushing for your application and new pins if needed.

3) Remove the caliper from the hub-rotor assembly.

4) Remove the plastic sleeves and the rubber bushings from the caliper.

5) Thoroughly clean and de-burr the inside of the holes.

6) Insert the brass bushing from the pad side. They should just drop in with a little clearance.. If not go back to step 5 above.

7) Install the snap ring on the back side of the bushing.

8) Inspect the threads on your pad holder bracket for miss-alignment or prior cross threading. If necessary chase the threads with a m10x1.25 tap. Also inspect the seat that the shoulder of the pin contacts for burrs.

9) Temporarily install the two guide pins into your pad holder bracket without the caliper or rotor in place and tighten them as you normally would.

10) Take your caliper assembly with bushings installed and see if it slides easily over the pins. If it does not you may need to replace the pad holder bracket or have it machined on the faces of the pin seats so that they are parallel to each other.

11) Remove the pins that were temporarily installed in step 9.

12) Install the slotted pistons into your calipers the same way that you would with the standard piston.

13) Assemble the caliper/rotor/pad assembly as you normally do insuring that the taper-cut pad is in the inboard (piston) side of the caliper.

14) Some people do not use lubricant on the pin to bushing or the bushing to caliper because they feel the lubricants attract dirt & dust which could do more harm than good.
Ken Grammer

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