English
Brake noise not only affects the driving experience, but may also be a signal of safety hazards. The following are systematic troubleshooting and solution methods, covering key factors such as mechanical principles, material characteristics, and maintenance processes:
1、 Quick diagnosis table for abnormal noise types
Abnormal noise characteristics, possible causes, danger level, solutions
Low speed light braking with a "squeaking" sharp sound, brake pad warning, and extremely worn iron plates ⚠️ Immediate replacement of dismantling and inspection thickness is required, and any remaining thickness less than 3mm must be replaced with a new one
Cold start metal friction sound, slight rust on the surface of the brake disc ✅ Normal phenomenon can be eliminated by lightly braking a few times during driving
There is a rattling noise when reversing, and the brake pad spring is loose or not installed properly ⚠️ Need to repair, reinstall and lubricate the guide pin
Continuous high-frequency whistling brake pad material is hard (low metal formula) ❗ Affects safety by replacing ceramic/NAO brake pads
Irregular "click" sound, brake pad backing plate falls off 🆘 Emergency maintenance: Stop immediately and tow the vehicle for repair
2、 6 Root Causes and Professional Solutions
1. Brake pad wear is very alarming
Principle: Most original brake pads are designed with alarm iron plates (which come into contact with the brake disc when the thickness is about 2-3mm)
Operation:
Python
If the thickness of the brake pad is less than 3mm:
Replace with a new film (it is recommended to replace coaxial pairs)
Else:
Check for other reasons
2. Material formula mismatch
Comparative experimental data:
Material Type Friction Coefficient Noise Probability Applicable Scenarios
Low metal 0.38-0.42 35% performance car
Ceramic composite 0.35-0.40 5% household car option
NAO Organic 0.32-0.38% New Energy Vehicles
Solution: Replace with ceramic based brake pads (such as Bosch Comfort Ceramic)
3. Abnormal brake system components
Maintenance checklist:
Brake disc scratch depth>1.5mm, disc/replacement required
Insufficient lubrication of the pump guide pin (using specialized silicon-based grease)
Shock absorber (shim) missing or oxidized
4. The running in period is not completed
New film adaptation standards:
Chart
Code
5. Foreign object intrusion
Processing procedure:
High pressure air gun for cleaning brake dust
Check if small stones are stuck (commonly seen after off-road driving)
Use brake cleaner to remove oil stains
6. Temperature related anomalies
Thermal shaking and abnormal noise: Brake disc deformed at high temperature (DTV>0.05mm) requires professional lathe repair
Low temperature hardening and abnormal noise: It is recommended to use winter specific brake pads in northern regions
3、 Key points of maintenance process (90% of abnormal noises can be prevented)
Pre installation processing:
Polish the edge chamfer of the brake pad with sandpaper (to eliminate stress concentration)
Apply sound-absorbing paste on the contact surface between the back plate and the piston
Torque standard:
Tool requirements for component torque value (N · m)
Brake caliper bolt 30-40 preset torque wrench
Tighten the wheel nuts 110-130 in a staggered cross pattern
Anti counterfeiting identification:
Authentic brake pad laser anti-counterfeiting code can be verified on the official website
Counterfeit products often have the following characteristics:
Packaging without production batch number
Friction materials have bubbles/impurities
4、 Special scenario solutions
New energy vehicle abnormal noise:
Due to energy recovery and reduced braking usage, it is recommended to clean and polish the brake disc every six months
Performance Car Track Day:
Be sure to drain the brake system after the race (to avoid abnormal noise caused by a decrease in the boiling point of brake oil)
5、 Cost optimization suggestions
Cost of the plan (in yuan), duration of effectiveness
Only replace brake pads 300-800 for 1-2 years
Replace brake pads+CD 600-1200 3-5 years
Complete brake system with deep maintenance for 1500-3000 years or more
Data shows that following SAE standard specifications during construction can reduce the recurrence rate of abnormal sounds by 75%.
Suggestion
Priority should be given to original factory certified parts or international ones (such as ATE, Philodo)
Reject the "three no" brake pads (the probability of noise from inferior products increases by 8 times)
Perform deep maintenance on the braking system every 20000 kilometers
Remember: Brake noise is not a minor issue, it may be the final warning issued by the braking system!
