No ABS on hard (pedal to the floor) braking
I was performing a brake pad burn in on a well worn set of brake because I read doing so can eliminate built up brake pad material on the rotor. Got the rotors warmed up then started the 8-10 passes of 60 to 15 mph. As I got on it I noticed there was no ABS. Eventually by the 3rd or 4th pass I gave the brake pedal everything my foot could give it, so pretty much standing on it. There was no ABS, not even a hint of it.
My concern is either the ABS system is not working or I have an aftermarket rotor/pad setup that is not jiving with the enthusiast model calipers in that even at full pressure there isn't enough clamping pressure to lock things up. Obviously locking up the rotors isn't desirable but the absence of ability to do so is concerning. Thoughts? |
You answered your own question. If you're not locking up the wheels, ABS will not intervene.
What exactly is your pad/rotor setup? And how old are the rotors? |
Originally Posted by karlt
(Post 10949430)
You answered your own question. If you're not locking up the wheels, ABS will not intervene.
What exactly is your pad/rotor setup? And how old are the rotors? The pads and rotors are 3 years old and probably have about 30,000 miles on them. |
I've had eBay pads before that caused the same issued you're having.
Switch to cheap semi-metallic pads from an actual parts store. |
If your brake pedal goes to the floor you need professional assistance. 02.
|
Originally Posted by iideadeyeii
(Post 10949594)
I've had eBay pads before that caused the same issued you're having.
Switch to cheap semi-metallic pads from an actual parts store. I did a search for this specific issue and came up short. |
Originally Posted by jhc
(Post 10949619)
If your brake pedal goes to the floor you need professional assistance. 02.
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Originally Posted by BlueSQ
(Post 10949626)
I'm curious about this. Is this because the pads and rotors I have aren't right for the size and clamping pressure of the stock caliper? They're definitely not cheap parts but the cars they go on likely have stronger calipers than the Z.
I did a search for this specific issue and came up short. |
Originally Posted by iideadeyeii
(Post 10949631)
It should lock up regardless. This happened to me on 2 different cars from pads I ordered online. Replaced with cheap autozone semi-metallic and it fixed the issue.
When you ordered online, did you buy sintered metal pads? The reason I'm asking is maybe it's the switch from full metal to semi-metallic organic that fixed the issue. They work differently to achieve friction. |
The online ones were "ceramic". My audi pulling my 2,000lb trailer almost couldn't stop off an exit ramp because they barely worked. Swapped to the autozone cheap pads and pulled 4,000lbs in the city no problem with stopping.
The car had new fluid/rotors also. |
Originally Posted by iideadeyeii
(Post 10949649)
The online ones were "ceramic". My audi pulling my 2,000lb trailer almost couldn't stop off an exit ramp because they barely worked. Swapped to the autozone cheap pads and pulled 4,000lbs in the city no problem with stopping.
The car had new fluid/rotors also. |
Thinking of going with Akebono slotted rotors and Hawk HPS pads (Ferro-Carbon compound).
That sound about right? |
I've gone with Hawk on my Z and hated them; I changed them out after about a month. Centric Cryo-Treated rotors and the Centric Posi-Quiet ceramic brake pads with shim kits are awesome for daily driving. I'm in a super-hilly neighborhood and the Centrics have never let me down.
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Originally Posted by BlueSQ
(Post 10951133)
Thinking of going with Akebono slotted rotors and Hawk HPS pads (Ferro-Carbon compound).
https://my350z.com/forum/brakes-and-...l#post10908738 I run EBC Yellow pads these days and they preform great. Ran Blue for track days but they are too dusty for a daily driver pad and need some heat to really grab well. Using all stock components you should be able to get into ABS pretty easily. It may not be how hard you press (IE: to the floor!) but how fast you get there. If you press down hard but too slowly (note: it may seem fast to you) the car will slow progressively without every reaching the lockup threshold. You would might be shocked at just how fast and firm you must be to reach ABS especially on a good surface. On a wet surface it will be much easier, but I don't recommending testing your ABS that way since you could lose control completely. I instruct at track days and my students are amazed at how hard you can brake and still have room to spare. Very few students get into ABS despite carrying way more speed then you do on the street. :dunno: other ideas: might be a tire issue, IE: the tires grip so well they don't skid. Or maybe by heating up the pads you might have actually over done it and glaze them over or could be getting some fade. If you got air in your brake lines from getting them really hot (air = boiled fluid) you will not be able to get the full force into the calipers (air can be compressed but fluid can't). As a result the brakes would be slightly mushy or soft. |
Originally Posted by JMII
(Post 10951839)
I got the Akebono's (with slotted Centrics) and do NOT like the Hawk pads, read why here:
https://my350z.com/forum/brakes-and-...l#post10908738 I run EBC Yellow pads these days and they preform great. Ran Blue for track days but they are too dusty for a daily driver pad and need some heat to really grab well. Using all stock components you should be able to get into ABS pretty easily. It may not be how hard you press (IE: to the floor!) but how fast you get there. If you press down hard but too slowly (note: it may seem fast to you) the car will slow progressively without every reaching the lockup threshold. You would might be shocked at just how fast and firm you must be to reach ABS especially on a good surface. On a wet surface it will be much easier, but I don't recommending testing your ABS that way since you could lose control completely. I instruct at track days and my students are amazed at how hard you can brake and still have room to spare. Very few students get into ABS despite carrying way more speed then you do on the street. :dunno: other ideas: might be a tire issue, IE: the tires grip so well they don't skid. Or maybe by heating up the pads you might have actually over done it and glaze them over or could be getting some fade. If you got air in your brake lines from getting them really hot (air = boiled fluid) you will not be able to get the full force into the calipers (air can be compressed but fluid can't). As a result the brakes would be slightly mushy or soft. |
ABS will only activate if the wheels would otherwise lock up and stop rotating. If your wheels aren't locking up there is no purpose in abs activating as it would only reduce your braking.
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Originally Posted by LiamGutierrez35
(Post 10952262)
ABS will only activate if the wheels would otherwise lock up and stop rotating. If your wheels aren't locking up there is no purpose in abs activating as it would only reduce your braking.
I'm curious, has anyone else experienced this after installing aftermarket brake components? |
If you can't lock the brakes, then I'd start by bleeding the brakes properly, with a positive pressure bleeder like this one:
https://www.motiveproducts.com/colle...-prong-bleeder You're not going to get enough fluid through the system using conventional methods of bleeding (brake pedal pumping or fluid vacuum pull). Positive pressure bleeding is really the ONLY way to properly bleed the car's brakes on the 350Z. Unless you do it this way, you're not going to get the pressure you need. If you have tried this and your brakes are still sloppy and don't lock when fully depressed, then you may be looking at a mechanical issue, either with the master cylinder, caliper(s), ABS actuator, lines, etc., etc. |
Originally Posted by zakmartin
(Post 10952560)
If you can't lock the brakes, then I'd start by bleeding the brakes properly, with a positive pressure bleeder like this one:
https://www.motiveproducts.com/colle...-prong-bleeder You're not going to get enough fluid through the system using conventional methods of bleeding (brake pedal pumping or fluid vacuum pull). Positive pressure bleeding is really the ONLY way to properly bleed the car's brakes on the 350Z. Unless you do it this way, you're not going to get the pressure you need. If you have tried this and your brakes are still sloppy and don't lock when fully depressed, then you may be looking at a mechanical issue, either with the master cylinder, caliper(s), ABS actuator, lines, etc., etc. |
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