Nissin | SKU: MCRK12

Nissin M/CYL REP Kit Rear MX 1/2

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$29.95
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Nissin M/CYL REP Kit Rear MX 1/2

Nissin M/CYL REP Kit Rear MX 1/2

$29.95 $28.15
Nissin M/CYL REP Kit Rear MX 1/2

Nissin M/CYL REP Kit Rear MX 1/2

$29.95 $28.15

The Nissin Master Cylinder Repair Kit is a direct-replacement rebuild solution for Nissin rear brake master cylinders with a 1/2 inch bore, designed for motocross and off-road motorcycles.

Sourced from Nissin — the original manufacturer of many OEM brake systems fitted to Japanese off-road bikes — this kit allows riders and mechanics to restore proper braking performance without replacing the entire master cylinder assembly.

  • Designed for Nissin rear master cylinders with a 1/2 inch bore
  • Intended for MX and off-road motorcycle applications
  • Manufactured by Nissin, the OEM supplier to major Japanese motorcycle brands
  • Restores master cylinder function without full unit replacement
BrandNissin
Model / SKUMCRK12
TypeMaster Cylinder Repair Kit
ApplicationRear brake, MX / off-road
Bore Size1/2 inch
  • Before installation, drain and dispose of old brake fluid in accordance with local regulations — brake fluid is hygroscopic and should not be reused.
  • Clean the master cylinder bore thoroughly before fitting the kit; any debris or corrosion can damage new seals immediately.
  • Lubricate new rubber components with fresh, clean brake fluid of the correct specification before assembly — never use petroleum-based lubricants on rubber brake parts.
  • Inspect the master cylinder bore for scoring or corrosion before rebuilding; a damaged bore will cause premature seal failure and the cylinder should be replaced rather than rebuilt.
  • After assembly, bleed the rear brake system completely to remove all air from the hydraulic circuit before riding.
  • Check for leaks at the master cylinder reservoir, banjo bolt, and bleed nipple after the first few brake applications.
  • Brake fluid should be replaced at the interval specified in your motorcycle's service manual, as absorbed moisture lowers its boiling point and can cause brake fade.
  • Store any unused kit components in a cool, dry location away from direct sunlight and petroleum-based products, which can degrade rubber seals.

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