My latest surprise was on my K1500, last fall. I had replaced the front hoses with Teflon-liner hoses during a major brake/suspension upgrade a couple of years ago; but I'd never bothered to do the rear hose.
A broken bleeder screw in a rear wheel cylinder forced a wheel-cylinder change... I might as well disconnect the upper end, and replace the hose--since I've owned the replacement hose for two years already.
I put it all back together, and the brakes have never been better.
I had almost exactly the same experience. In my case, while replacing a leaking rear line, I swapped my JB6 rear cylinders for the K3500 rear cylinders... and installed the replacement hose that had been sitting around for 4-5yrs, long after I had replaced the front hoses.
That rear brake hose made a lot more difference to the brakes than I thought it might. The replacement rear cylinders didn't hurt either.
Braided brake flex hoses ... can make a substantial difference in pedal feel. Put them on one vehicle and you will put them on everything else you own. You've been warned.
Ain't it the truth! I just put those hoses on a 2005 RX330. Did it need them? Nah... but I like 'em
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