1978 Polaris RXL Service Manual, Page 58Get this manual
BRA KE IN SPECTION AND MAINTENANCE !
The RX has self-adjusting brake frictio pad sAt reaso nably frequent inte rva ls, he brakes shou ld be inspected for brak lever reserveThis is th clearance between he lever and handl ebar grip Inspectio sho uld be mad with he lever firmly dep ressed Lever reserve shou ld no be less tha 12 "As th frict io pads wear and self adju st, brak fluid is displaced from th brake master cy linde reservoir to the brake caliper piston bor eTherefo re it is recommen ded th at the fluid level in th master cy linder be main ta ined to 18belo th co ver pe riodic bas isI is lso important to check the condition and remaining thickness of the fricti on pads regular lyWhen th frictio pads are wo rn to less than one half heir riginal thick ness (appro xim ately .225"1, the pad shou ld be replaced BRA KE ROU BL INDICATI ONS AND CORRECT IONS A
Excessive lever travel 1Fluid reservoir low em pt y