Maruti Swift that I own was due for a 5K tyre rotation, something that I undertake religiously. So, I took the car to a decent looking road side workshop near Kondapur, Hyderabad. I had a pleasant experience with them few months back, when they did a splendid job rotating the tyres and doing wheel balancing, alignment etc.
While removing one the tyres for rotation, the mechanic found that one of the hub lug bolt had worn down, and advised me to get that lug bolt replaced, to which I agreed. Although only one lug was stripped, I asked him to replace all 4 lug bolts, just in case.
After opening the disc brake assembly, he reached the phase where the disc brake was properly unbolted and was out of the way, disc rotors were taken out, and wheel hub was out in the open, unconcealed. So, now what remained to be done was to just hammer out the 4 lug bolts (as I later saw on YouTube was a popular of accomplishing this task).
However, the mechanic insisted that the wheel hub be be taken out completely (by uncoupling it from the axle) so that it frees the hub and he then gets enough room to operate on the hub and pull out the lug nuts. Expecting him to know what he's doing and trusting his "expertise", I nodded and allowed him go ahead and do his job. But when trying to remove the hub, he got to the point where the hub was dangling half way out and was being obstructed with the Disc Brake Dust Shield in preventing it from being completely extracted out. Sample photo of dust shield
here (not my car)
At this point, he insisted that he can't proceed further without either damaging the hub or the disc brake shield. Now, he was clearly neither able to put the hub back to its original place, nor was was he in a position to extract out the hub, without twisting and damaging the dust shield.
I had never taken this car to any place other than MASS for anything other than minor maintenance like tyre rotation, oil change etc, and didn't know what to do. Being in a fix, I told him to try his best to do as little damage as possible and get the hub out. He apprised that he'll need to yank out the dust shield for that, but warned me that it would render the shield useless.
At this point I had no other choice but to let him proceed so gave him a go. He used pliers to twist and shear the shield, and finally yanked it out. After his operation was over, it had made enough room for him to maneuver and he was able to extract the hub out of the axle, and put new lugs and finally put everything back in place. So far so good.
Now I told him to put a new shield back. BUT to my surprise, he told me that not only did he not have a spare shield to put back in place of the one he yanked out, but also that there is no MGP Maruti spare part for the shield and that I'll have to live without one for that particular wheel for rest of the car's life! He insisted that the shield serves no purpose and having worked as a mechanic at Maruti authorized center (GEM Motors, Hyderabad), he knows this for a fact that it is a useless part in Maruti cars.
Here is what the shield looks like (after he twisted and yanked it out from behind the wheel hub):
Not buying his bull-cr@p, I have a few questions:
- I'm sure that Disc Brake Dust Shields (also called Splash Guards) are there for a purpose. Probably, as the name suggests, it prevents water from splashing into the disc brake/rotor and perhaps also prevent road grit from hitting the moving rotor which probably might be dangerous thing if it happens. Otherwise why would a manufacture put the shield in the first place? Or is it to comply with some CMVR rule? On searching the net, I found conflicting/incongruous articles, with some experts saying that its OK to let go of the shield, while many others also indicating that it is necessary part for wheel's long term health and safety.
What do the experts here suggest?
- Has anyone gotten this shield replaced, say, due to it rusting out etc. That would at least give me some comfort that there is infact an OEM/MGP spare for it, and then I can go to the nearest MASS and get it replaced.
Or is there any truth to the mechanics assertion that the shield only comes factory fitted and once removed there is no way or means to put a spare one back? Personally, I find it a bit hard to believe.
How worried should I be due to shield not being present on one of the front wheels? I hope it doesn't compromise the safety of the brakes.
I'd appreciate if an expert BHPian experienced in this could chime in. Otherwise I was thinking of going to MASS to inquire myself.