1986 Nissan Sentra 1987-88 Nissan Pulsar Bleeding Fast Fill Master Cylinder

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Some 1986 and later Nissan Sentras and some catchpan underneath the master cylinder. 1987-88 Pulsars have been equipped with "fast Depress the brake pedal fully several times. With fill master cylinders". A different brake bleeding the brake pedal fully depressed, carefully loosen procedure is required. the brake line at the primary bore of the master The fast fill master cylinder has two unique cylinder. When the fluid begins to leak from the characteristics. The rear half of the primary connection and the pedal goes to the floor, tight- piston and bore are larger in diameter than the en the brake line. Slowly release the brake pedal secondary bore. There is a fast fill valve and wait five to ten seconds for the secondary between the fluid reservoir and the primary bore. piston to return all the way. Repeat this proce- This valve allows fluid to flow quickly into the dure until clear brake fluid comes out of the brake primary bore and slowly back into the reservoir. line at the primary bore. Also perform this proce- This causes the secondary piston to return to its dure at the brake line of the secondary bore. normal position very slowly when the brake Continue to bleed air out of all brake lines, wheel pedal is released. cylinders and calipers using the standard bleed- Check the lower surface of the cylinder. If the ing method. Be sure to wait five to ten seconds casting is the same diameter for its entire length, after releasing the brake pedal, to allow the sec- the cylinder is a fast fill. If the casting is larger in ondary piston to return all the way. You can use diameter near its mounting flange, the cylinder is the same bleeding procedure for the standard the fast fill type. master cylinder but the waiting period is not To bleed the fast fill master cylinder, first place a required.