Hi Guys,

i have test driven 350 F Sport yesterday, i felt that there is something wrong with the brakes as they make some noise whenever brake pedal is pressed/ depressed specially when car is stopped. the car is a dealer demo and has done 1200KM (750 miles) with first service done 2 days ago at 1000 km.

the sales guy says this is normal for lexus brakes which i cannot believe. i have never driven one before, any comments?

 

As far as i know the 350 has the same brakes as the 250 and 300 h (350 not available in Sweden). None of the cars i tested had noise coming from the brakes.

 

brake disc size is different:

350 (F/non F):
Brake Type - Front

334mm ventilated discs

Brake Type - Rear

310mm ventilated discs

250:
Brake Type - Front

296mm ventilated discs

Brake Type - Rear

291mm ventilated discs


but even though, size difference should not be an issue

 

F-Sport have more aggressive pads, which may be noiser

 

I have a 350 F-Sport....no abnormal noise coming from my brakes. Dust city though...

 

No noise here either but brake dust is a huge problem.

 

This........ no issues here

 

My bad. But your data seems off. In my data sheet IS250 has solid disks on the rear wheels.
300h have vented disks on all wheels. I don't know the dimensions, but i'm 99% sure it's over 300mm both front and rear. 350 brakes due to higher curb weight?

 

IS250:
Front: 296 x 28mm Non-Directionally Vented Discs (F-Sport: T4146 Pad Material, Non-F-Sport: D6893H Pad Material)
Rear: 290 x 10mm Non-Vented Discs (NS542 Pad Material)

IS350:
Front: 334 x 30mm Directionally Vented Discs (F-Sport: T4146 Pad Material, Non-F-Sport: PV565H Pad Material)
Rear: 310 x 18mm Vented Discs (NS542 Pad Material)

I don't have the IS300h specs readily available in front of me.

Jeff

 

are you talking about the noise that EVERY automatic car makes when the brakes are depressed slowly? like a slow grinding noise? sounds and feels like the car is being pulled against its will? is this only happening when you are coming to a stop very slowly and when you let go of the break really slowly? happens when you're riding the brakes?

if so, this is normal. your car is always in gear (except in neutral - not sure about Park cause its a bit different but im digressing) so your car wants to keep moving forward (or backwards if in reverse). For arguments sake lets set the commitment level of the vehicle wanting to move forward is 100%. Well...your brakes work in a similar fashion but when you let some of that forward momentum roll between your brake pads because youre applying "97%" then you hear that "noise". You can easily try this out by comparing this to a manual tranny which, while it may be in gear, it doesnt go anywhere until you apply the throttle. you can also try this on the 3IS. stick it in drive and depress the brake until you can duplicate the noise then stick it in neutral and depress the brake as slowly as you can. If your car is not on a slope you shouldn't hear the noise anymore. if this is not the case then it could be the calipers not depressing all the way. same issue but different culprit.

 

hmm, i took the specs from the dealers' website, it could be wrong though.


i know what you're talking about, i have driven/owned other automatic cars (sedans and SUV's, BMW,VW,Honda,Mitsubishi) but none does the same.