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1Back to top Go down    Another Brake Question. on 2nd May 2017, 20:47

yamaguzzi

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Are there front and rear master cylinder rebuild kits out there? Mine still work but . You know,the bike sat since 2004 . I took the rear one apart and cleaned it all out because it was locked up. That worked and it feels good but it's not new or rebuilt with new parts,just cleaned up and a flush with fresh fluid and a bleed. The front worked so I just did a bleed with new fluid but now after a year it's getting sluggish when I release the leaver and not popping back out like it should. I'd really like to rebuild both units. As for the rest of the bike , I have made real progress and the new fuel system is all installed. The tank is back on the bike and once I put gas in it and a battery in the bike I am ready to fire it . So,any helpful pointers on where I can get rebuild stuff for the masters will be greatly appreciated. Thanks,Ed ( yamaguzzi)


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1988 K 100RS ,1975 Moto Guzzi 850-T , 1971 BMW R60/5 , 1971 Yamaha R5B,1969 Yamaha DS6C ,1966 Yamaha YM1 , 1965 Yamaha YDS3
https://facebkfugitive.blogspot.com/
    

2Back to top Go down    Re: Another Brake Question. on 2nd May 2017, 21:14

Laitch

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@yamaguzzi wrote:Are there front and rear master cylinder rebuild kits out there? . . . So,any helpful pointers on where I can get rebuild stuff for the masters will be greatly appreciated.
Beemer Boneyard often has them in stock.


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1995 K75T 68,000 miles
    

3Back to top Go down    Re: Another Brake Question. on 3rd May 2017, 02:21

blaKey

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Do a search here on the Forum.

Don't expect much in the kit...Google some images and you'll see what I mean.

A spring and some plastic. Stoopidly priced for what you get.


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Neil
K100RS 1986 RED!
K100RT 1987 (now nekkid with red bits)

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4Back to top Go down    Re: Another Brake Question. on 3rd May 2017, 02:24

Point-Seven-five

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Don't waste your money on the rear master cylinder. There are a couple of us on the Motobrick.com forum who have replaced the OEM master cylinder with one of these.

http://www.ebay.com/itm/MOTORCYCLE-QUAD-PIT-DIRT-BIKE-ATV-REAR-FOOT-BRAKE-MASTER-CYLINDER-RESERVOIR-/172224850029?hash=item281966a86d

Takes an afternoon with some hand tools to make the modifications to get it to work, but the price is right and it works great compared to the previous Magura master cylinders and the $200+ I had in them trying to make them work.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down    Re: Another Brake Question. on 4th May 2017, 04:02

Gaz

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Point 75, that would be worth it just for the reservoir. Good find.

Cheers


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Gaz
95 K1100LT 0232224; 90 K75 6427509; 87 R80G/S PD 6292136
    

6Back to top Go down    Mods? on 25th June 2017, 15:34

tagaz

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@Point-Seven-five wrote:Don't waste your money on the rear master cylinder. There are a couple of us on the Motobrick.com forum who have replaced the OEM master cylinder with one of these.

http://www.ebay.com/itm/MOTORCYCLE-QUAD-PIT-DIRT-BIKE-ATV-REAR-FOOT-BRAKE-MASTER-CYLINDER-RESERVOIR-/172224850029?hash=item281966a86d

Takes an afternoon with some hand tools to make the modifications to get it to work, but the price is right and it works great compared to the previous Magura master cylinders and the $200+ I had in them trying to make them work.

Looking at the image, I see what appears to be modification to the plunger rod. ie. cut and threaded with a nut installed.
Are any other mods required? TIA, Troy

    

7Back to top Go down    Re: Another Brake Question. on 25th June 2017, 16:14

Point-Seven-five

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@tagaz wrote:
@Point-Seven-five wrote:Don't waste your money on the rear master cylinder. There are a couple of us on the Motobrick.com forum who have replaced the OEM master cylinder with one of these.

http://www.ebay.com/itm/MOTORCYCLE-QUAD-PIT-DIRT-BIKE-ATV-REAR-FOOT-BRAKE-MASTER-CYLINDER-RESERVOIR-/172224850029?hash=item281966a86d

Takes an afternoon with some hand tools to make the modifications to get it to work, but the price is right and it works great compared to the previous Magura master cylinders and the $200+ I had in them trying to make them work.

Looking at the image, I see what appears to be modification to the plunger rod. ie. cut and threaded with a nut installed.
Are any other mods required? TIA, Troy

The only modifications I did were to cut the threaded plunger rod to protrude from the cylinder about the same distance as the OEM plunger and put a slight counter bore in the cut end to hold the pin on the pedal centered. This was necessary because the rod was about 5" long and had a clevis on the end. The nut is the lock nut for the pin adjustment locked on the pedal. The plunger rod is spring centered, so it doesn't need much.

I also had to connect the reservoir hoses together which required making a coupling with 6mm on one end and 8mm on the other. I did that by soldering parts cut from two couplings together.

The mounting holes match up nicely with the holes in the plate. I just needed to use longer screws to mount the master cylinder.

1500 miles now, and it still works great. If not for this thread, I have forgotten it's not OEM.


__________________________________________________
Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

8Back to top Go down    Thank You for the Details on 25th June 2017, 16:51

tagaz

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Thank you for sharing the details.

Definitely a big $ saver.

    

9Back to top Go down    Re: Another Brake Question. on 25th June 2017, 17:02

MartinW

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I'm running the same brake cylinder, once modified I wont even bother with kits. I bought a spare one for stock complete cylinder $13.33 AU. For that price why bother with kits. The new one is actually feels better in my opinion than the OEM.
Regards Martin

    

10Back to top Go down    Re: Another Brake Question. on 25th June 2017, 17:14

MartinW

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Very cheap conversion, break down of the cost in OZ currency Chinese M/Cyl $13.33 pedal stop bolt $2.00 new boot $4.00 boot retaining clip $2.00 new hose $10.00 ( but $60.00 retail) M/Cyl retaining bolts and washers $2.00 Hose reducer 6mm to 8mm $5.00. hose clips $2.00. brake fluid $5.00 total cost $45.33. Next time it will cost me $13.33 plus $5.00 for the brake fluid. Two others had a slight problem bleeding I had very little problem with my Nescafe bleeder I just had to push the pedal down as I hit the trigger on the suction gun. Installed new M/Cyl March 12th the pedal is firmer than the original but not uncontrollable or in anyway a concern.. The only problem was a slight weep where the hose connected to the M/Cyl from the reservoir caused by the spring type clip which I replaced with a screw type. I ordered three more M/Cyl two for a mate and one for spare. When storing M/Cyl's you need to remove all traces of brake fluid and coat internals with rubber grease. http://www.motobrick.com/index.php/topic,9364.msg79956.html#msg79956
Regards Martin.

    

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