As searched and spoken with TM engineer at TASS seems this is mostly applicable to Safire engines and TM is aware of this. As of now TM does not have any resolution for the problem. The problem statement:
With AC is on and bumper to bumper traffic (I mean where needle of speedometer even doesn't bother to move) where brakes are mostly used rather than accelerator along with either ascent and descent on slope I encounter brakes fade or becomes too hard. Its not like that brakes don't get applied by requires significant efforts and car takes much more time to get onto stand still (in initial days I had some nightmares for the same
, even had to shell out 1500/- for no damage but that is another story). Only option is switch off the AC and brakes return to normalcy TASS reaction on the problem:
I have complained this many times to TASS and every time my ride ensures to let me down and pretends that the problem does not exists whenever TASS tries to replicate the problem. Luckily TM engineer has acknowledged that this is know problem and solution does not exists for it as of now. He told me that only option is to tweak brake timing very slightly and slightly change driving habits. I normally don't drive my ride on clutch but I am forced to do because of the issue mentioned above.
Explanation given by TM engineer for above issue is, since brakes and AC draw power from engine and for conditions like above engine is revving normally sightly above ideal RPM limit and AC draws major power and vacuum pump suffers causing brake fades. Shutting off AC redirects major power to vacuum pump in turn restoring the brakes. My thoughts:
As per me this is a design issue whereby engine power distribution is not properly controlled. Brakes (safety) should always take higher priority rather than AC (comfort).
Your thoughts on this please and any better work around for this for people like me who face the issue. Please note that I have bought my ride in Mar'09 and hopefully this issue does not exists in new versions available today.