## AI Summary The Reddit post from r/CX50, titled \\"Stock brakes,\\" discusses a user's (u/jimmytheworld) issue with a loud front-end knocking sound in their 2023 Mazda CX-50. The user suspects aftermarket Bosch brake pads (bc2426) have excessive vertical play (5-7mm) within the caliper housing. They are seeking the \\"pin to pin (max length)\\" measurement of OEM brake pads from other owners to compare. In a follow-up, the user states that Wagner ZD2426 pads reduced vertical play but still had lateral play. They discovered OEM glide clips had adhesive, and they used a synthetic rubber adhesive as an alternative. The user now suspects the caliper mounts are slightly out of spec and reiterates the request for measurements of the brake pad tabs that slide into the caliper mount. ## Original Content Hey all, For anyone that has done a brake job and has the OEM pads sitting around, could you please take take the measurement of the pad, pin to pin? (Max length) I was stupid enough to throw the eom pads out. Thanks for your help! Background: I have a loud knock in the front end of my car. This car has had a transmission replaced so the whole thing has come apart. The master mechanic disassemble and reassemble everything to to torque spec again to ensure that it was done well, get the sound persists. He pointed out the Bosch pads (bc2426) as being the most likely culprit. They can move up and down in the the caliper pad housing, maybe a 5 to 7 millimeter. I don't think that's the sound I'm hearing. Regardless, waiting on Wagner pads to compare to. --- ## Comments > **AutoModerator** • [1 points](https://reddit.com/r/CX50/comments/1gbk65v/comment/ltmex3j/) • > > # It looks like you have a question or issue! > > We are here to help but we need your help as well. Make sure your question or issue has the following info included or it may get deleted. > > 1. Did you use the search, if so, what info did you find helpful. If the info was unhelpful, what gaps are you seeing in the info. > 2. Did you check the [Wiki](https://www.reddit.com/r/CX50/wiki/index/) ? If you didn't find what you were looking for, let the group know. Also, let us know if there are dead links or seemingly bad information there. > 3. Be sure to check the [CX50 Manual](https://www.mazdausa.com/static/manuals/2023/cx-50/visual.html) > > *I am a bot, and this action was performed automatically. Please* [*contact the moderators of this subreddit*](https://www.reddit.com/message/compose/?to=/r/CX50) *if you have any questions or concerns.* > **Bruin1010** • [1 points](https://reddit.com/r/CX50/comments/1gbk65v/comment/mlkme2c/) • > > Hi there, I’m planning on doing a front brake job on my CX-50 soon and was considering the Bosch pads, but ran across your issue and was wondering if the Bosch pads were really your issue or not. Did you get the Wagner ZD2426 quick stop ceramic pads, and if you did how are they? Also what rotors are you using? Thanks. > > > **jimmytheworld** • [1 points](https://reddit.com/r/CX50/comments/1gbk65v/comment/mllvddz/) • > > > > Hey so I bought a ton of brakes and took measurements of them. Most were pretty close in dimension. WAGNER ZD2426 has been the best so far, no vertical play but still plenty of lateral play. When I took off the original the glide clips had adhesive on them, fixing the clip to the caliper mount. Never found out what that adhesive was. It was gray. I found an alternative rubber (. Three Bond Synthetic Rubber Adhesive 1521-75) adhesive that helps with the vertical movement. I didn't apply it to the sides of the clip so I get very loud metal on metal sounds when the pads move over some bumps. > > > > Then I took measurements of the caliper mounts and they are out by a few thousands of an inch. So my guess it's the caliper mounts are out of spec. I have a 2023 so very much a COVID car. I've had several major issues with the car so probably just my bad luck. > > > > If you could take measurements of the brake pads and share it with me that would be a great help, specifically the tabs that slide into the caliper mount. > > > > Anyways, hope that helps