Back around May of last year I rebuilt my front calipers. The BMW kit runs about $60-80 per caliper. On the other hand rockauto sells generics for about $5 per piston = $10 per caliper. Looking at application tables show the kits apply to multiple cars from multiple manufacturers. Nothing special about our brakes - as long as piston size matches brake seals are pretty much standard.
So I ordered three brands from Rockauto: ACdelco, Raybestos and Centric. From memory the acdelco or raybestos piston boots tore as I was just installing them. The other (acdelco or raybestos) boots are cooked a year later see pic below. Granted this is with track use and DTC60 pads; they'd prob be fine with street driving. The centrics however look like new. The centric piston boots are light grey in color which made me question them initially but a year later I was proven wrong. Unfortunately rockauto does not sell centrics anymore / maybe centric stopped supplying them. I see they're still listed on centrics catalog as 143.34021.
Garbage acdelco or raybestos boot:
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So I ordered three brands from Rockauto: ACdelco, Raybestos and Centric. From memory the acdelco or raybestos piston boots tore as I was just installing them. The other (acdelco or raybestos) boots are cooked a year later see pic below. Granted this is with track use and DTC60 pads; they'd prob be fine with street driving. The centrics however look like new. The centric piston boots are light grey in color which made me question them initially but a year later I was proven wrong. Unfortunately rockauto does not sell centrics anymore / maybe centric stopped supplying them. I see they're still listed on centrics catalog as 143.34021.
Garbage acdelco or raybestos boot:
