Motor Vehicle Maintenance & Repair Asked on June 23, 2021
I need to repair my car in order to get a safety check certificate.
The rotor that the workshop would be getting for it is 2x RAYBESTOS 780541R for the rear wheels. According to the rockauto website, these rotors are 302 mm (or 11.890 in). However, this same website shows other types or Rotors that would be compatible with my car, such as some of 262 mm (or 10.31 in) of diameter.
I already check the owner’s user guide and manual to confirm these numbers but I can’t find any reference.
This other website says that the Rear Brake Rotor Diameter is 10.3 in (or 261.62 mm).
Apparently, according to the physics (posted in this forum) the bigger the rotor the more braking power there is. If that is the case, wouldn’t a bigger size be preferable?
Where I can find the "official" size of Rotor I should pick?
Also, I am in Canada, meaning, tons of salt on the roads during the winter. Plus a little bit of snow. Shouldn’t this body shop be ordering/recommending coated rotors (as well as callipers)?
Is coated rotors always preferable for places that use salt on the roads?
Thank you for your time.
As Solar Mike explained in his comment you need to measure the existing rotors on your car as the rest of the system is matched to them.
Certain cars even have the rims matched to accomodate the brake.
Coated rotors, in a rough sketch, are just rotors that get shipped with some coating instead of protective oil. A mechanic needs to remove the oil before mounting, but can install the coated ones without further preparation. The rust, without regular driving, will always attack the rotors as they, inclusive the coating, get worn by braking. The caliper itself is mostly cast iron or aluminum and relatively resistant to rust, so no coating is required. Most of the time it is the sliding mechanism thats get blocked by rust and grime, cleaning and lubricating this is part of regular brake maintenance.
Answered by Martin on June 23, 2021
To your first question: the only reasons larger rotors would effect braking is because that they allow larger pad sizes or the caliper would bring the pads higher on the rotors. So "braking power" would not be improved in your situation because you are presumably not changing pad size or calipers.
Answered by Jupiter on June 23, 2021
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