Hi all, Just a quick question. Does the VT/VX SS have twin piston calipers on the front only or both front and rear? I'm going to replace the rotors/calipers on my executive and was considering twin pot as my old singles are wearing through rotors like they're made of cardboard and good working twins are quite cheap now. I will be rebuilding/painting them before fitting.
wat break pad are u using. if ur using something like bendix ultimate they are to hard for standard rotors and thats whats chewing them out. And there twin front and single rear piston
Thanks for the info Brad. Yes they are bendix ultimate, that's what was recommended by the brake place that put them in. Also interestingly enough, they advised me that these pads did not need bedding in, but to drive and brake easily for a week following installation and now they squeal like stuck pigs!! I'll get twins for the front then and what pads are suggested? Preferably ones that won't squeal. Cheers!
QFM HPX for the win! http://forums.justcommodores.com.au...vt-vz-police-spec-performance-brake-pads.html
Your calipers are already twin. To stop the squealing, bed them in. Do about 6 hard brakes from 60km/h down to 10km/h without coming to a complete stop in between. Your brakes will smell really bad, but this will bed them in and should get rid of the squealing. Bendix Ultimates are not the pad of choice by a lot of people. QFM HPX police spec pads are very good. EBC green stuff are good too. I would suggest putting on slotted rotors as well.
Thanks for the replies. Definitely will be putting slotted rotors on. I'll have to check the calipers but I thought the series 1 execs only had single piston, if not then bonus, only need to change rotors.
The brake system is completely new on the vt SERIES 1, featuring twin piston calipers on the front, and greatly improving the brake pedal's feel in reducing brake pedal travel, and also reducing brake fade. UPGRADE OPTION FOR YOUR CAR, MODEL PK1 VT COMMODORE BRAKE UPGRADE - PBR AUSTRALIA PBR Performance 330 x 32 mm front vented rotors 315 x 18mm rear vented rotors braided lines 6 slots per rotor 73.1 mm disc size on the fronts. High gloss caliper finish - red or yellow. ADVANTAGES OF UPGRADE Reduces brake fade Increase thermal propertys and perfromance Reduce pedal travel Better brake feel. Agressive style
yeh they were right they dont need bedding in mine said that on the box aswell. but they are a very hard compound pad and are meant to be used on a performance rotor the standard holden rotors are to soft so ive heard from alot of people.
hey dudes, i'm about to install some vt twins with police pads, slotted rotors, braided lines and VT master on my VS. Typically, how long would it take for new rotors and pads to be "bedded" in sufficiently before they start to work properly and consistently? Just wanting to know whether i have enough time to get them working well before sunday lol. cheers
Bedding in should only take about 30mins (although most new pads these days have bedding in stripes built in) Take the car to a quiet piece of road and from 60kph (no higher) break hard/firm (don't jump on the brakes) and then repaet this process about 4-5 times allowing time between each for the brakes to cool down. The VT into VS seems different for so many people using it, some say a little loss of pedal height but firm where as other report sponginess and others report huge loss of pedal height. I sometimes think it's just personal preferrence but I know from my own experience at least also replace the 3 rear hoses with braided lines as well for better pedal feel.
I do brakes at a mates workshop and we subscribe to the gently and slowly process. This makes sure your calipers stay at the optimum angle during the bed in time (1 week) to wear the pads evenly initially. If the pad wears more at the rear at first (due to stamp braking) it will forever be hot at the rear and cooler at the front of the pad. This means your minimum operating temp will always be that little bit higher. To stop squealing we always use copper anti seize grease in the back of the pad and never have an issue (even with EA falcons lol). The grease only needs to go on the surfaces that contact the caliper btw. As fro pedal feel, I would recommend bleeding out the brake fluid at a max of 2years but usually every time you change the pads is better if funds permit.
thanks guys, those tips will certainly help out! I'll be very interested to see how the feeling of the VT brakes differ to the stock ones. If its not all that crash hot, i'll chuck on a VT booster + m/c kit, along with braided rear lines. Oh i've got some DOT 4 brake fluid sitting here, but DOT 3 is specified. Whats the difference between the 2, and is it still alright to use? thanks again :thumbsup:
