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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: bcstingray on April 09, 2016, 01:15:04 pm

Title: Brake Rotor
Post by: bcstingray on April 09, 2016, 01:15:04 pm

I'm in the process of changing the front brake caliper, hoses, rotors and pads on my 73. When I took the rotors off I found that it had the 1.25 inch rotors. The rotors I bought (before I took them off) were the 1 inch.

Does it matter if I use the 1"rotors?

Title: Re: Brake Rotor
Post by: bd on April 09, 2016, 01:41:37 pm

1" and 1.25" rotors are not interchangeable.

Brake Tech, what do all the numbers mean... (http://forum.73-87chevytrucks.com/smforum/index.php?topic=28592.0)

Title: Re: Brake Rotor
Post by: bcstingray on April 09, 2016, 02:32:53 pm

Thanks. The rotors I took off have a groove on both sides of the rotor. I've never seen this before. The grooves are in the same spot on each rotor.

Title: Re: Brake Rotor
Post by: 80Chevy4x4 on April 09, 2016, 03:58:39 pm

If the grooves are identical in both rotors and they are almost in the middle of the pad surface on the rotor GM has put a single groove in rotors in the past.

Title: Re: Brake Rotor
Post by: bcstingray on April 09, 2016, 05:58:32 pm

Like these?

(http://i1275.photobucket.com/albums/y449/bcstingray/grooved%201_zps80vajvdl.jpg) (http://s1275.photobucket.com/user/bcstingray/media/grooved%201_zps80vajvdl.jpg.html)

(http://i1275.photobucket.com/albums/y449/bcstingray/grooved_zpsj8qw1mrc.jpg) (http://s1275.photobucket.com/user/bcstingray/media/grooved_zpsj8qw1mrc.jpg.html)

Title: Re: Brake Rotor
Post by: bd on April 09, 2016, 07:32:53 pm

Those grooves are machined by the manufacturer.