Hi,
i would like to know weather required or not to bleed ABS modulator, there's no bleeding screw on it, i'm changing master cylinder last week, after done bleeding, brake not really good, after perform hard brake, brake become more responsive, and then, next day, brake not responsive again, im already check brake component such as master brake, lines, its dry.

 

Did you Bench-Bleed the master before you installed it? Might have a bubble there...

The ensure that the ABS is bubble-free, you need to invoke the ABS pump. (brake with one side of the car on a gravel shoulder, or wet patch)

Then, bleed again.



Alternatively, you could pay to have a dealer bleed the brakes (their diagnostic system can engage the ABS pump while they bleed). How close is the nearest dealer to you in Malaysia?

 

Thanks for reply,
i'm already bench bleed the master cylinder before installation, and pedal feel firm after bleed on all caliper, but after a few day, it not firm anymore, seem loose pressure or leak somewhere, but i'm check all hoses & caliper, everithing is dry...

 

Perhaps a rubber brake line hose is failing.

They often look fine from the outside but fail on the inside. ('Balloon' out, it doesn't take much to give a soft pedal)



I'd do the ABS thing first, then if the issue remains, think about replacing rubber brake lines. (Though, Hondas do NOT have this issue as much as other makes)

Also, a pressure or vacuum bleeder might give you a better bleed than brake pedal pumping. Have you tapped on the MC while bleeding? This dislodges air bubbles.

Good Luck!

 

This is my setup for bench bleeding, yup I'm did a soft tap and lean the mc left and right, brake fluid come without air bubbles

 

I'm confused, I'm not loosing brake fluid, and brake system not keep the brake pressure

 

But the pedal is firm (not sinking) just after you do a bleed?


Let us know the results after you 'work' the ABS system and re-bleed.

 

Pedal is firm after done bleeding, and after a 1-2 days, brake bexome spongy n not grip, after hard brake (abs activated), brake pedal is grip again

I will try to activate abs and re-bleed, will let you know the result by tomorrow