I am looking for an upgrade to my front stock calipers and the "M" caliper for solid rotors seems to be a good choice. The car has a 19mm master cylinder and the braking could be better and instead of replacing the master cylinder with a 17mm I thought I'd upgrade the front calipers.
From what I can tell early 911/912 calipers for solid rotors will be a direct bolt on to the early 914 strut. I also think they use the same brake pad.
Has any one done this or can someone confirm that they will be a direct bolt on and is the pad size the same?
thanks
-Rob
Eric has to chime in ... I think the offset is different and the rotor won't center in the caliper.
Early BMW calipers will bolt on an early strut and center correctly. There are threads about that "upgrade". To fit later cars, I remember the mounting ears have to be shaved 0.125" on the inside AFAIR. Don't remember the years of the Beemer either.
My understanding of the 19mm master with the stock calipers is there is less force on the brakes than with the 17mm. I read this in several places like the Lapuwali write up on brakes. Therefore if I put larger calipers or a 17mm master I will increase the force on the brakes.
I am running Porterfields. It may be less expensive to upgrade the caliper especially if I can use my existing pads.
I also found a brake http://www.pelicanparts.com/techarticles/914_BMW_calipers/914_BMW_calipers.htm on the bird board that says the "m" calipers will bolt right on the early struts and use the same size pad. I checked both pad (911 & 914) part numbers at PMB and they are the same. The Brembo brakes in the classified are said to bolt on, but I can't really find a second (or third) confirmation that they do.
Get a stock 17mm master cylinder and put some GOOD pads on all four calipers. Use stock rubber lines too.
the right pad makes stock calipers VERY VERY good.
most people the "upgrade" their calipers are really benefitting from a rebuilt "system" more than any improvement in in caliper over stock
buy good pads (RS4)
new lines
and quality brake fluid
if you have any rotor warp take care of that too.
Thanks for the replies.
I do have good pads, R4S, in the front only and I was told (by Rich at HPH) that I dont really need them in the rear; should I order some? PMBseems to have good prices.
All 4 calipers were rebuilt 2 years ago, no pitting in the bores or on the pistons, new seal kit from PMB & braided lines. Venting clearance is as close to .004 as I could get it; recently double checked.
I did not bed my pads. I'll give that a try. I probably could use new tires.
Not trying to sell a set of pads but... 914 brakes are very well balanced. I like the same compunds front and rear.
Here's the bedding procedure:
http://www.pmbperformance.com/Bedding.html
Remember: Brakes stop the wheels.
TIRES stop the car.
--DD
Eric, I did pick up some rear pads last night. I always try and purchase local if I can even though your prices are about $10 cheaper. I appreciate your expert opinion. I found a second set of rear rotors in my stash that look to be unused and I will put them on with the pads.
I have only bedded pads once before and never on my 914, so i' ll give it a go. I will also bleed the system and report back with the results. I don't know if I'll finish today as the family and I are going to try and learn to Eskimo roll our kayaks this afternoon.
Thanks
-rob
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