Brake pedal goes hard during boost

Rustom

Member
Joined
Apr 30, 2022
Location
India
TDI
Mk6 Jetta
Hi Experts,

This is my very first post in Tdiclub!
I have a 2014 manual Jetta TDI (right hand drive) with 95k km on the Odo. My engine code is CLCB. I believe it is basically a CJAA minus the DPF.
While doing a hard pull if I immediately apply the brakes, I notice that the brake pedal is hard to press (not super hard, but slightly harder than usual). Brake pedal also stiffen up if I pump the brake pedal for about 3 times when engine is running.

Usually this does not bother me. But this does cause a concern in slow moving bumper to bumper traffic where I have to apply brakes repeatedly.
My brake booster seems to be good as it easily holds vacuum for several days.

I have been facing this issue for more than one year, but noticed the brake pedal stiffening up issue during boost last week. I do not understand, why brake booster would lose vacuum during boost. I am not mechanically inclined, but I did take a look at the vacuum lines for any cracks and found none. Connection to the vacuum pump also looks intact. Any suggestions would be highly appreciated
 
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