Buick 4-Spot Billet Disc Brake Conversion Kit AU  

1) 4-Spot Billet Disc Brake Conversion Kits
(63-70 Riviera, 61-70 Electra, LeSabre, Invicta and Wildcat)

Proudly Made in Australia by RRS

For the ultimate in serious performance, this kit uses a custom-modified RRS Cobra 4 spot billet calliper. It’s absolutely the most advanced braking system available for muscle cars. The mini bridge allowing rapid heat disbursement. This brake package includes the latest Ultra Ceramic friction technology which gives ultra fast stopping power, consistent braking performance, low dust and low noise.
About the caliper:

    • Internal cross fluid plumbing with o-ring seals, no external cross lines.
    • Billet bridge for max airflow and exceptional calliper rigidity.
    • Noise alert chirpers to warn of pad wear.
    • Stainless steel pin-located "Nissan Skyline" pads.


    This kit includes:
    New Vented Rotors 11.86" (301.244mm) dia 1.28" (32.5mm) thick - Full size Buick 5 on 5" stud pattern
    New quality inner and outer wheel bearings and seals
    All mounting hardware (adaptor brackets with high tensile bolts)
    Approved Braided SS lines and mounting hardware (pair)
    RRS Cobra Billet Calipers custom-made for Buick (pair)


FAQ's (frequently asked questions)
Scan through what we have here and if your query is not covered, please contact us.
Technical questions most welcome.

After-market wheels 16" dia or larger have adequate calliper clearance. - Alloy wheels for the prototype kit were 16x7" American Racing.

1. What modifications if any may be required to fit this kit?
With suitable wheels as mentioned above, this kit is designed to simply bolt-on without any modifications to the vehicle.

2. Do these brakes comply with the latest relevent standards?
They comply with Australia standards, as in they use existing OEM parts and have dust seals on the pistons.
* The kit should be fitted by a qualified mechanic and by rights the intallation certified by an engineer.

3. Are replacement parts available in the USA?
Yes, rotors, wheel bearings and seals are standard Buick over the counter. Brake pads are Nissan Skyline.

4. Some existing kits available only have 11" rotors small calipers.
What are the benefits of larger rotors and 4 spot calipers?

Efficient braking requires the conversion of your car's kinetic energy into heat. This heat is produced by friction between the rotor and the disc brake pads The rapid dissipation of this generated heat is critical to good brake function. 4 spot calipers will slow a 2 ton vehicle down quicker and easier.

5. I have power drum brakes, can I use the same booster with this kit?
Yes, amazingly you can, there is no need to change booster with this kit.

6. Does the master cylinder have to be changed?
No, this brake kit will work fine with the original factory 1" bore MC. However, you should consider upgrading to a Dual Brake Master Cylinder for obvious safety reasons. This is identifiable by the size of the reservoirs. One larger (for front) and one smaller (for rear).
*Australian customers - HQ Holden MC have 1" bore and will make an easy and inexpensive upgrade.

7. Will I need to install a Proportioning Valve?
No we don't believe so based on our experience on 65 Riviera test-car.
After the test car's brake pads were bedded in the brake system is perfectly balanced so rear brakes do not lock up under hard braking.
* With the factory drum brakes it's easy to lock up all the wheels, which is particularly dangerous in the wet.
Disc brakes will make braking more progressive and safer and you will feel confident allowing others to drive your car in all conditions.

8. How will I know if my system is balanced or not?
Once the new brakes are bedded in which can take about 100 kms (60 miles) of use it can be determined quite quickly if front to rear braking is balanced by test driving in a quiet street or carpark. With the rear drum brakes adjusted correctly, if the rear wheels lock up easily under hard braking compared with before, you could
a) install a proportioning valve which goes between the MC and the two lines. Or
b) change the rear wheel cylinders to smaller bore.
* Original bore dia is 1") Switch the rear wheel cylinders to Ford (1949-74) which have a 7/8" bore and bolt straight it

We do not think this will be necessary however!