How do I bleed a master cylinder with a fast-fill mechanism?

Fill the reservoir with recommended brake fluid and keep it full, remove the primary line (rear line, nearest the vacuum booster), place a container beneath the master cylinder, depress the pedal fully, release slowly, wait five seconds, and repeat until clear fluid comes out. Then retighten the line, bleed the line-junction the same way, and finally bleed the secondary bore using the same procedure but waiting 20 seconds or more and never pumping the pedal.

Which wheels are on the secondary piston circuit of the master cylinder?

The secondary piston pressurizes the right rear wheel cylinder and the left front caliper.

Which wheels are on the primary piston circuit?

The primary piston pressurizes the left rear wheel cylinder and the right front caliper.

Can I pump the brake pedal while bleeding the secondary side?

No. The document states: do not pump the pedal at any time while bleeding air out of the secondary system, and wait 20 seconds or more after releasing the pedal.

What is the procedure for bleeding a wheel cylinder or caliper on the secondary circuit?

Top up the reservoir, connect a transparent vinyl tube to the air bleeder valve, depress the pedal all the way down without pumping, open the bleeder valve to release air, close it, release the pedal slowly, wait 20 seconds, and repeat until clear brake fluid comes out of the bleeder valve.

Home/ Registry/ Nissan/ Micra/ 1990 Nissan Micra/ Photo supermotors.net/registry/media/266405

Nissan Micra Brake Bleeding Procedure - Master Cylinder & Caliper Hydraulic System

Hydraulic brake system bleeding procedure for fast-fill master cylinder, primary and secondary circuits

‹ ›

Brake bleeding procedure for a fast-fill master cylinder: bleed primary line at MC, then secondary circuit wheel cylinders/calipers. Pump pedal, hold 20 sec when bleeding secondary; repeat until clear.

AI caption November 2005 · Photo 287 of 412

This is page BR-3 of a factory service manual section titled "Bleeding Hydraulic System — Bleeding Procedure." It provides step-by-step instructions for bleeding air from a diagonally-split brake hydraulic system. Section A covers bleeding a master cylinder equipped with a fast-fill mechanism: keep the reservoir full, remove the primary line (rear line, nearest the vacuum booster), pump and release the pedal with five-second waits until clear fluid appears, re-tighten the line, bleed the line-junction, then repeat on the secondary bore using 20-second waits and no pedal pumping. Section B covers bleeding the lines and wheel cylinders/calipers pressurized by the secondary piston (right rear wheel cylinder and left front caliper) using a transparent vinyl tube on the bleeder valve, single pedal depressions (no pumping), and 20-second waits between cycles. Section C covers the circuit pressurized by the primary piston (left rear wheel cylinder and right front caliper), where the pedal is fully depressed several times before opening the bleeder valve. An illustration (SBR606) shows a caliper with a clear tube routed from the bleeder valve into a catch bottle. Readers learn the correct bleeding sequence, which wheels belong to each hydraulic circuit, and when pedal pumping is or is not allowed.

Is this accurate? Sign in to help verify it.

Frequently asked questions

How do I bleed a master cylinder with a fast-fill mechanism?: Fill the reservoir with recommended brake fluid and keep it full, remove the primary line (rear line, nearest the vacuum booster), place a container beneath the master cylinder, depress the pedal fully, release slowly, wait five seconds, and repeat until clear fluid comes out. Then retighten the line, bleed the line-junction the same way, and finally bleed the secondary bore using the same procedure but waiting 20 seconds or more and never pumping the pedal.
Which wheels are on the secondary piston circuit of the master cylinder?: The secondary piston pressurizes the right rear wheel cylinder and the left front caliper.
Which wheels are on the primary piston circuit?: The primary piston pressurizes the left rear wheel cylinder and the right front caliper.
Can I pump the brake pedal while bleeding the secondary side?: No. The document states: do not pump the pedal at any time while bleeding air out of the secondary system, and wait 20 seconds or more after releasing the pedal.
What is the procedure for bleeding a wheel cylinder or caliper on the secondary circuit?: Top up the reservoir, connect a transparent vinyl tube to the air bleeder valve, depress the pedal all the way down without pumping, open the bleeder valve to release air, close it, release the pedal slowly, wait 20 seconds, and repeat until clear brake fluid comes out of the bleeder valve.