View RSS Feed

Today at Atelier Kaz - ex-Honda R&D, F1, Indy/CART engineer

Front Brake Inspection 01

Rate this Entry
2 Comments
by
Kaz-kzukNA1
, 08-02-2012 at 10:37 PM (2003 Views)



The owner was told by the MOT place that his Front brake was showing more than 20% of imbalance between the Right and Left corners.

I overhauled these callipers in 2010 so about 1.5yrs ago and it went through several services by other places without any issues so wanted to have a look by myself.

We are also replacing the brake hoses and the master cyl for other reasons so before disturbing the Hyd system, removed the FR calliper and operated the brake pedal with my hand.




Both inner and outer pads were not glazed and the surface was evenly pressed against the disc. Also, they were not seized to the bracket.







As expected, both pistons smoothly pushed out by the pedal pressure and each pistons werer pushed back by the finger with ease.

The upper and lower slider pins were moving smoothly so the FR side looked to be fine.

Will check the FL side tomorrow.


The pedal feeling felt quite stiff compared to my NSX that had its brake Hyd system bled after the recent Eng Refresh. Pedal feeling will be significantly affected by the pads so can’t do a direct comparison but I already have the later spec calliper, latest ABS, etc that are the same as this NSX and I’m using the Type-R pads which is very hard on the disc so would be interesting to see how it feels after replacing the master cyl and brake line.


Will also apply small pressure through the master cyl using the pressure bleeder to feel by myself the actual friction level at each corners. May even take it to my MOT place to check the balance.

More to follow later.

Kaz
Categories
Brake

Comments

  1. britlude's Avatar
    hmmm interesting.... when mine has gone for MOTs, the inspector is instructed by the system NOT to check the brakes on the rollers, but on the road with a decelerometer.
  2. Kaz-kzukNA1's Avatar
    Interesting to hear that the MOT database is showing not to test NSX brake on the roller. It’s not AWD or 4WD system and the OEM ride height is not too low for most of the MOT stations.

    At the front, compliance pivot will shift during the brake testing on the roller as the rear end is locked by applying the full brake pressure by the tester but don’t think it will cause any damages to the suspension parts, alignment or leading to a wrong diagnosis.

    At the rear, depending on the spec of your LSD (earlier model) and friction of the roller itself, it may trigger small amount of imbalance between R & L while no brake pressure was applied resulting in misdiagnosed calliper seizure.

    So far, never felt any issues using the roller for MOT on my NSX….