{"id":198,"date":"2020-05-23T10:12:34","date_gmt":"2020-05-23T09:12:34","guid":{"rendered":"https:\/\/bxproject.co.uk\/blog\/?p=198"},"modified":"2021-11-09T21:55:12","modified_gmt":"2021-11-09T21:55:12","slug":"citroen-bx-brake-valve","status":"publish","type":"post","link":"https:\/\/bxproject.co.uk\/blog\/citroen-bx-brake-valve\/","title":{"rendered":"Citro\u00ebn BX &#8211; Brake valve overhaul"},"content":{"rendered":"<span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\"><\/span> <span class=\"rt-time\"> 2<\/span> <span class=\"rt-label rt-postfix\">min. read<\/span><\/span>\n<p>The BX 16Valve, being French and Citro\u00ebn, is less than straightforward when it comes to suspension, steering and brakes. With the age of the vehicles, wear in the hydraulic components is an ever-growing problem. It&#8217;s finally time to solve one of my long-standing hydraulic issues, the brake valve.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Rear brakes and suspension<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"452\" src=\"https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Doseur_01_wp.jpg\" alt=\"Brake Control Valve - Doseur\" class=\"wp-image-199\" srcset=\"https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Doseur_01_wp.jpg 800w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Doseur_01_wp-600x339.jpg 600w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Doseur_01_wp-300x170.jpg 300w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Doseur_01_wp-150x85.jpg 150w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Doseur_01_wp-768x434.jpg 768w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Doseur_01_wp-250x141.jpg 250w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption>Citro\u00ebn BX Brake Control Valve &#8211; Doseur<\/figcaption><\/figure>\n\n\n\n<p>One of the biggest annoyances I have with the car is a sinking feeling in the rear end under braking. In normal circumstances, the high-pressure supply to the rear of the vehicle drives both the suspension and the brakes. However, once the rear suspension has risen, little fluid is required to keep the very light rear end off the tarmac. This leaves more than enough pressure for the rear brake discs. Unfortunately, in my car, holding the brake bleeds the pressure in the rear to the point the suspension sinks.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Citro\u00ebn BX brake valve seals<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"537\" src=\"https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Schematic_01_wp.png\" alt=\"Brake Control Valve Schematic - Citroen XB 453-4\" class=\"wp-image-200\" srcset=\"https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Schematic_01_wp.png 800w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Schematic_01_wp-600x403.png 600w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Schematic_01_wp-300x201.png 300w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Schematic_01_wp-768x516.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption>Brake Control Valve Schematic &#8211; Citroen XB 453-4<\/figcaption><\/figure>\n\n\n\n<p>The sinking is caused by worn seals in the Citroen BX brake valve. As can be seen in the diagram above, there are quite a few seals that can wear. The internal movement of the valves is only small, but with a lot of fluid passing through and many thousands of brake applications, wear is inevitable.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Refurbishing a brake control valve<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"579\" src=\"https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/IMAG2016-1024x579.jpg\" alt=\"Brake Valve Stripped Down and Seals Removed\" class=\"wp-image-201\" srcset=\"https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/IMAG2016-1024x579.jpg 1024w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/IMAG2016-scaled-960x543.jpg 960w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/IMAG2016-300x170.jpg 300w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/IMAG2016-768x434.jpg 768w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/IMAG2016-1536x869.jpg 1536w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/IMAG2016-2048x1158.jpg 2048w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/IMAG2016-1920x1086.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Brake Valve Stripped Down and Seals Removed<\/figcaption><\/figure>\n\n\n\n<p>I won&#8217;t cover refurbishing the brake valve here are there are great websites already coving it, such as the Tramontana website. However, being 30 years since the BX first hit UK roads, repair parts such as seals are becoming a struggle to find. While some dedicated Citro\u00ebn Specialists, such as Chevronics, are starting to remanufacture parts, some are just not available.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"283\" src=\"https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Seals_01_wp.png\" alt=\"Finding Seals is getting harder\" class=\"wp-image-202\" srcset=\"https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Seals_01_wp.png 800w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Seals_01_wp-600x212.png 600w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Seals_01_wp-300x106.png 300w, https:\/\/bxproject.co.uk\/blog\/wp-content\/uploads\/2020\/05\/Seals_01_wp-768x272.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption>Finding Seals is getting harder.<\/figcaption><\/figure>\n\n\n\n<p>Fortunately, my local Citro\u00ebn dealer was able to help me source the most critical parts, allowing the valve to be rebuilt. While I&#8217;ve had the refurbished valve on the car for over a year now, it&#8217;s done little mileage. The hydraulic system has only recently been refurbished with new LHM and complete re-piping.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">And the result of overhauling the valve<\/h2>\n\n\n\n<p>The difference is fantastic. The rear suspension was sinking almost immediately on turning off the engine. It&#8217;s now staying up for hours. More importantly, the brake pedal, typically while waiting at lights, the rear end is no longer slowly sinking. Very much a problem solved, and it has improved my enjoyment of the car!<\/p>\n\n\n\n<p>M<br><\/p>\n\n\n\n<p><a href=\"https:\/\/bxproject.co.uk\/blog\/citroen-bx-instrument-cluster-led\/\">NEXT &#8211; Instrument cluster with LEDs<\/a><br><a href=\"https:\/\/bxproject.co.uk\/blog\/citroen-bx-restoring-mirrors\/\">PREV &#8211; Restoring the wing mirrors<\/a><br><br><a href=\"https:\/\/bxproject.co.uk\/blog\/category\/automotive-adventures\/citroen-articles\/\">Back to Citroen Articles<\/a><br><a href=\"https:\/\/bxproject.co.uk\/blog\/automotive\/\">Back to Automotive Articles<\/a><br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A sinking feeling in the rear end was getting me down, but rebuilding the brake control valve has kept me upright and happy!<\/p>\n","protected":false},"author":1,"featured_media":199,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[5,15],"tags":[69,68,31,10,70,27,47,71],"class_list":["post-198","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-citroen-bx-articles","category-hydraulic","tag-brake-valve","tag-brakes","tag-bx-16valve","tag-citroen","tag-doseur","tag-hydraulic","tag-leak","tag-seals"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Citro\u00ebn BX - Brake valve overhaul - BX Project<\/title>\n<meta name=\"description\" content=\"It&#039;s finally time to solve one of my long-standing issues on the Citro\u00ebn BX. 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