"nj959" (nj959)
08/13/2018 at 21:30 • Filed to: None
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"nj959" (nj959)
08/13/2018 at 21:30 • Filed to: None | 0
| 6 |
I posted earlier asking about possible air in the lines after the brake job I did Saturday, so I figure I should post an update.
I bled the lines again today and didn’t get any air bubbles out of them at all. I think I was just a little paranoid about the pedal feeling a little different than it had before since I didn’t have any of the other symptoms of air in the lines (sinking pedal, long pedal travel, etc). Especially since the pedal isn’t really “soft”. The brakes bite perfectly within 1/2"-1" of pushing in the pedal, it just feels a little easier to press the pedal. I’m guessing this is because of two reasons: the new pads are ceramic, which I’ve heard can feel different from oem pads and the new pads probably aren’t fully broken in yet since it’s tough to find a place to bed brakes near me (busy suburban nj). I had to go to an empty parking lot to bed them on Saturday so of course I couldn’t get up to more than 35 mph or so.
Anyway, thank you for all the advice. It’s good to have brakes that don’t squeal or make the whole Jeep shudder.
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> nj959
08/13/2018 at 22:32 |
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Did you stomp three times to cycle the ABS pump like I suggested?
If so, you actually probably DO have a real problem. Pop them back off and check the pad slider section. You probably have binding in the caliper. The fix is to file any severe burrs on the slider section and lube (use high temperature ceramic or graphite grease.)
Do not ask how many times I had to fix WJ/WK brake jobs somebody else did fast rather than right . Not that DumberChrysler helped any. (Pads and rotors under warranty? It’s a Jeep thing, you don’t want to understand.)
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nj959
> Spamfeller Loves Nazi Clicks
08/13/2018 at 22:39 |
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!!! UNKNOWN CONTENT TYPE !!!
What do you mean by this? I did get the ABS to activate, it worked the same as it always has. I did take another look at the calipers and pads while the wheels were off, and everything looked as it should. I installed new hardware (the metal bits that the pads* slide along) along with the pads and rotors and lubed everything that needed to be lubed. Why do you say the calipers are binding?
edit: pads, not calipers
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> nj959
08/13/2018 at 23:04 |
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Honest answer? PTSD. I was a wrench for DumberChrysler / GM and ZJ/WJ/WK always devoured brakes. And I was primarily drivability, so, “my brakes feel funny” after a brake job? “Hey RootWyrm. Test this Jeep. Brake complaint.”
If the ABS triggered and you got push-back on the pedal? (T he push-back is important - no push-back, system pressure low.) It usually indicates binding. If the pad bedding was truly FUBAR , well, you’d be complaining about more than spongy pedal. Ceramics shouldn’t be spongy either - Dr. RootWyrm prescribed ceramic for ‘my brakes feel crap’ complaints. (These things are really under-braked.)
Usually what it is, is binding in the calipers due to casting defects that only show up when braking under load. The casting quality on the calipers was pretty shit more often than not, and if you live where there’s salt, they love to develop corrosion related binding.
Try this (on an empty street with LARGE runout.) With the Jeep in drive, apply as much braking pressure as you can with your leg. You shouldn’t be able to do a ton. Hold that, and very slowly apply throttle with a friend standing nearby . These things make torque down low. If you feel any movement from the brake pedal without the Jeep moving, you’ll want to test the fluid (test strip) and check the rubber lines. Then ease out of the brake very carefully. If you get squeal/shriek, need to re-bed the pads. If you get chirp/creak, you have caliper binding (the chirp/creak is the pads getting kicked back.) No noises or movement, then you can chalk it up to whoever made this batch of pads and rotors.
gogmorgo - rowing gears in a Grand Cherokee
> nj959
08/13/2018 at 23:14 |
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I did pads, rotors, shoes, and drums on my ZJ last week. Best quality stuff Napa could get me. The brake drum boxes were caked with dust, I’m guessing it’s been a lot time since anyone else has bought “premium” drums for a Dana 35... But I digress. After bedding them in with three lock-’em -up stops from 60 mph in a row (and the requisite rear brake adjusting b y stomping on the brakes a few times from flat-out in reverse) my brakes are like throwing out an anchor. But like you said, there’s an odd sort of easiness to them. Not unsettling, and the pedal is still firm, they just seem to be asking me to step on them harder, get them hotter. I still had no issues stopping a 5500 lb trailer going down a 7% grade, although admittedly the trailer’s surge brakes may have helped a bit with that.
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nj959
> Spamfeller Loves Nazi Clicks
08/14/2018 at 17:18 |
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Thank you for all the advice.
The pedal actually felt better today, pretty much exactly as it did before I did the brake job. I’m willing to chalk it up to the brakes not having been fully bedded. However, I’ll be doing an oil change at some point this upcoming weekend so I’ll pull everything apart while I have it up on stands just to make sure everything looks as it should after a week of driving.
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> nj959
08/14/2018 at 17:23 |
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My pleasure, and glad to hear it! It probably really is something stupid and minor. But for some reason, brakes are kind of important, so always better to be safe than sorry.