Broken Bus Mirror: Replace Just the Glass, or the Whole Arm?
5 minute read · ·BAYKOÇ Technical Team
Clipping a mirror during a terminal manoeuvre or in a narrow passage is close to routine. Most operators’ reflex is to replace the entire mirror assembly — yet in the majority of cases only the glass, or only the cover, needs replacing, and the cost drops to a third. Here is what to look at before deciding.
When glass replacement alone is enough
If all of the following hold, replacing the glass is sufficient:
- The mirror housing and cover are intact, with no cracks.
- The arm tube is straight, with no bending or twisting.
- The mirror still holds its adjustment; moved by hand, it stays where you put it.
- If it is a heated mirror, the heating still works (replacing the glass renews the heating element anyway).
When the whole arm is needed
If any of the following is present, the arm assembly must be replaced; fitting glass alone is a temporary measure:
- The arm tube is bent. Straightening fatigues the metal; it will snap at the second impact.
- The mounting foot is cracked or a weld has opened.
- The mirror vibrates in motion or cannot hold its position. A vibrating mirror gives no usable view — this is a safety issue.
- The joint has developed play and the angle you set drifts on the road.
Extra checks on electric and heated mirrors
On electric mirrors, an impact that broke the glass may also have damaged the mirror motor. Before fitting new glass, test the motor: with the unit off the vehicle, operate the switch and confirm the mechanism moves in every direction.
On heated mirrors the heating element is bonded to the back of the glass, so if the glass broke, the heating went with it. If you do not specify heated when ordering replacement glass, you will receive unheated glass and face fogging problems in winter.
What to tell us when ordering
Fitment is stricter on mirror parts than on most other groups. When ordering, send us: the vehicle make and model, the production year, whether it is the left or right side, whether it is heated or electric, and whether the glass is flat or convex.
The most practical route is to send a photo of the broken mirror. The mounting type is readable from the photo, and the risk of a wrong part disappears.
Part Categories in This Article
The parts discussed above are in stock in the following categories.
Related Makes
Frequently Asked Questions
Can bus mirror glass be bought on its own?
Yes. If the housing and arm are sound, only the glass needs replacing, which is far cheaper than a complete assembly. Heated and convex versions are available separately.
Can a bent mirror arm be straightened?
It is not advisable. Straightening fatigues the tube and it will break at the next impact; the vibration usually does not go away either. A bent arm should be replaced.
What information do you need to supply a mirror?
Vehicle make and model, production year, left or right side, whether it is heated or electric, and whether the glass is flat or convex. Easiest of all is a photo of the broken part.
