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Tips for DISC BRAKE, Brake Disc Sets, Brake Pad Set, Pads And Disc Brake Kit, Wear Indicator Diagnosis  process for braking circuits and how it is implemented |

Technical Service Bulletin for DISC BRAKE, Brake Disc Sets, Brake Pad Set, Pads And Disc Brake Kit, Wear Indicator, 186112 - Valeo Service

Diagnosis  process for braking circuits

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="2"><strong>Step 1 : hecking fluid condition</strong></td>
		</tr>
		<tr>
			<td>Check</td>
			<td>Fluid boiling point</td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>Loss of brake fluid properties</td>
		</tr>
		<tr>
			<td>Reference Value</td>
			<td><strong>See table 2</strong></td>
		</tr>
	</tbody>
</table>

<p>&nbsp;</p>

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="3"><strong>Table 2: fluid characteristics</strong></td>
		</tr>
		<tr>
			<td><strong>Brake</strong> <strong>fluid</strong></td>
			<td><strong>Boiling</strong><strong> point as new</strong></td>
			<td><strong>Minimum </strong><strong>boiling</strong><strong> point</strong></td>
		</tr>
		<tr>
			<td>DOT 3</td>
			<td>205℃</td>
			<td>140℃</td>
		</tr>
		<tr>
			<td>DOT 4</td>
			<td>230℃</td>
			<td>155℃</td>
		</tr>
		<tr>
			<td>DOT 4+</td>
			<td>260℃</td>
			<td>180℃</td>
		</tr>
		<tr>
			<td>DOT 5</td>
			<td>260℃</td>
			<td>180℃</td>
		</tr>
		<tr>
			<td>DOT 5.1</td>
			<td>270℃</td>
			<td>190℃</td>
		</tr>
	</tbody>
</table>


Problem: braking distance increase / soft pedal / without pedal

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="2"><strong>Step 2: checking disc condition</strong></td>
		</tr>
		<tr>
			<td>Check</td>
			<td>Tolerance of surface wear</td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>Disc excessive wear</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823864-14r302et0p-whr.jpg" /></td>
		</tr>
	</tbody>
</table>

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="2"><strong>Step 3: checking pads condition</strong></td>
		</tr>
		<tr>
			<td>Check</td>
			<td>Pads thickness</td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>Pads worn out</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823867-8mkg37l1rp-whr.jpg" /></td>
		</tr>
	</tbody>
</table>

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="2"><strong>Step 4: checking fluid leakage</strong></td>
		</tr>
		<tr>
			<td>Check</td>
			<td>Calliper pistons. wheel cylinder, master cylinder/hoses</td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>Fluid leak/Loss of efficiency</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823870-0aad1pc6gh-whr.jpg" /><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823873-xvnteqnmi7-whr.jpg" /><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823879-v55167rdem-whr.jpg" /></td>
		</tr>
	</tbody>
</table>


<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="2"><strong>Step 1: Checking point</strong></td>
		</tr>
		<tr>
			<td>Check</td>
			<td>Rusty marks in disc</td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>Humidity</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823876-qe9ykl8ffw-whr.jpg" /></td>
		</tr>
	</tbody>
</table>


Problem: squeak/noise

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="4"><strong>Step 1: checking points</strong></td>
		</tr>
		<tr>
			<td><strong>Check </strong></td>
			<td><strong>Pads cracks, </strong><strong>lack</strong><strong> of compound</strong></td>
			<td><strong>Caliper</strong><strong> pistons</strong></td>
			<td><strong>Pads wear/disc marks</strong></td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>Pads delamination/breakage</td>
			<td>Unevenly pressed on pads from brake pistons</td>
			<td>Unparallel contact between pads and disc cause vibration<br />
			Inferior braking pads fitted</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td colspan="3"><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823882-x0jixgjxgl-whr.jpg" /></td>
		</tr>
	</tbody>
</table>


Problem: squeak/noise/discontinuing braking

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="3"><strong>Step 1: checking points</strong></td>
		</tr>
		<tr>
			<td><strong>Check </strong></td>
			<td><strong>Pads marks</strong></td>
			<td><strong>Pads &amp; disc marks</strong></td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>Chamfer on the edge of pads</td>
			<td>Uneven contact between pads &amp; disc<br />
			Improper pre-treatment to pads, results bad contact to disc</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td colspan="2"><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823885-8s2kduoow0-whr.jpg" /><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823888-usf0aky0q9-whr.jpg" /></td>
		</tr>
	</tbody>
</table>


Problem: vibration (judder)

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="2"><strong>Step 1: check point</strong></td>
		</tr>
		<tr>
			<td><strong>Check </strong></td>
			<td><strong>Pads &amp; disc marks</strong></td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>Inadequate break-in procedures/run-out</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823891-wxxe7ag30c-whr.jpg" /></td>
		</tr>
	</tbody>
</table>

<p>&nbsp;</p>

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="2"><strong>Step 2: check point</strong></td>
		</tr>
		<tr>
			<td>Check</td>
			<td>Disc wear</td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>Excessive wear out of tolerance</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823894-1hh0qk922r-whr.jpg" /></td>
		</tr>
	</tbody>
</table>

<p>&nbsp;</p>

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="3"><strong>Step 3: checking points</strong></td>
		</tr>
		<tr>
			<td><strong>Check </strong></td>
			<td><strong>Chamfer of pads rubbing with disc</strong></td>
			<td><strong>Compatibility of between pads/disc</strong></td>
		</tr>
		<tr>
			<td>Cause</td>
			<td colspan="2">Bad/non chamfer on brake pads</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td colspan="2"><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823897-8w6mrcjv3v-whr.jpg" /><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823900-5knkg8djld-whr.jpg" /></td>
		</tr>
	</tbody>
</table>

<p>&nbsp;</p>

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="2"><strong>Step 4: check point</strong></td>
		</tr>
		<tr>
			<td><strong>Check</strong></td>
			<td><strong>Caliper displacement/blocked</strong></td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>Bad release of the brake pads</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823903-1n0dq1gv6v-whr.jpg" /></td>
		</tr>
	</tbody>
</table>

<p>&nbsp;</p>

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="2"><strong>Step 5: check point</strong></td>
		</tr>
		<tr>
			<td><strong>Check</strong></td>
			<td><strong>Caliper displacement</strong>
			<p>&nbsp;</p>
			</td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>Excessive piston displacement</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823906-43ckingc6p-whr.jpg" /></td>
		</tr>
	</tbody>
</table>


Problem: squeak/noise without braking 

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="2"><strong>Step 1: Check point</strong></td>
		</tr>
		<tr>
			<td>
			<p><strong>Check </strong></p>
			</td>
			<td>
			<p><strong>Pads/</strong><strong>caliper</strong></p>
			</td>
		</tr>
		<tr>
			<td>
			<p>Cause</p>
			</td>
			<td>
			<p>Bad position of bad caliper</p>

			<p>Damaged hardware kit/caliper clips</p>
			</td>
		</tr>
		<tr>
			<td>
			<p>Reference picture</p>
			</td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823909-r96oax1iqu-whr.jpg" /></td>
		</tr>
	</tbody>
</table>


Problem: banging during braking 

<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="3"><strong>Step 1: check point</strong></td>
		</tr>
		<tr>
			<td><strong>Check</strong></td>
			<td><strong>Pads quality</strong></td>
			<td><strong>Pads/disc surface</strong></td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>High metal content in brake pads</td>
			<td>Stone next to the rotor or pads</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823912-qn9ivq4q11-whr.jpg" /></td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823915-pw78hhcldx-whr.jpg" /></td>
		</tr>
	</tbody>
</table>


<table border="1" cellpadding="1" cellspacing="1" class="DJ__responsiveTable__processed table">
	<tbody>
		<tr>
			<td colspan="3"><strong>Step 1: check point</strong></td>
		</tr>
		<tr>
			<td><strong>Check </strong></td>
			<td><strong>Pads quality/caliper piston</strong></td>
			<td><strong>Pads wear</strong></td>
		</tr>
		<tr>
			<td>Cause</td>
			<td>Overheating</td>
			<td>Excessive pad wear</td>
		</tr>
		<tr>
			<td>Reference picture</td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823918-q7lhx04n1w-whr.jpg" /></td>
			<td><img alt="" src="https://assets-valeo.keepeek.com/pm_8143_823_823921-08wswmu46c-whr.jpg" /></td>
		</tr>
	</tbody>
</table>


Problem: metallic sound after braking