Xoutpost.com - View Single Post - Master Cylinder replaced, brakes won't bleed

StephenVA · #4 03-05-2021, 09:40 AM

To save your fingers here is the process once again

Brake bleeding procedure (DIY annal version)
1. Suck all old fluid from master cyl reservoir
2. Top off brake fluid DOT 3/4 (Do NOT use cheap store brands) (Preference: Valvoline Synthetic DOT 4)
3. Pressurize system to 15-20 PSI using tool of your choice (Example: https://www.ecstuning.com/b-motive-p...eder/motivepb/)
4. Plug in scanner/test unit and select brake bleed for ABS (Tool example: Foxwell 510/530)
5. Move to RR, open caliper bleed screw with hose to catch bottle
6. Flow until bubbles stop (make sure fluid in Reservoir stays more than 1/2 full
7. Turn on ABS cycle purge, flow until no bubbles, then pump pedal 5 X
8. Turn on ABS cycle purge once again Bubbles? Flow until clear
9. Tap/hit Caliper with rubber mallet
10. Flow until clear
Move to LR, RF, then LF repeating steps 5-10
I personally do a final go around after all are clear to be safe.
11. Road test making sure ABS gets activated on loose road surface No need for stomp and lock on Hwy.
12. Final re-bleed to confirm all is well

Pedal should be normal at this point. If not look for master Cyl, vacuum line check valve, or power booster failure. On X5 4.8is there is a vacuum pump on the Right front cam that leaks and will fail sooner or later. On this fail, pedal is perfect until engine start, then it drops off.

Can you short cut this process and come out OK? Y/N

If all you are doing is a bi-annual bleed out and you have no pedal pump up (NO AIR trapped in lines). Your brake fluid flush is really simple, skip steps 7, 8, 9, and 12.

Helpful?

Valvoline DOT 3 and 4 Brake Fluid (32 oz.)

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